Refactor, separate docs from headers, add ru docs

Doxygen kind'a sucks and I need multilanguage documentation, so I did
that. Also, separated massive Math.h file into smaller files.

doc/Manual/en/BH_Ray2f.pod

@@ -0,0 +1,205 @@
+=encoding UTF-8
+
+
+=head1 NAME
+
+BH_Ray2f, BH_Segment2f - Ray/segment on a plane
+
+
+=head1 SYNTAX
+
+ #include <BH/Math/Ray2f.h>
+ 
+ cc prog.c -o prog -lbh
+
+
+=head1 DESCRIPTION
+
+This module provides functions for working with rays and segments on a plane.
+It includes functions for checking intersections between rays, segments, lines, 
+and bounding rectangles.
+
+
+=head1 API CALLS
+
+
+=head2 BH_Ray2fIntersectLine
+
+ int BH_Ray2fIntersectLine(const float start[2],
+                           const float direction[2],
+                           const float line[3],
+                           float *t,
+                           float out[2]);
+
+Checks the intersection between a ray and a line.
+
+The parameters I<start> and I<direction> describe the ray.
+
+The parameter I<line> describes the line.
+
+The parameter I<t> describes the resulting time of the ray's intersection.
+
+The parameter I<out> describes the resulting intersection point.
+
+If successful, the function returns 0, otherwise it returns an error code.
+
+
+=head2 BH_Ray2fIntersectTime
+
+ int BH_Ray2fIntersectTime(const float aStart[2],
+                           const float aDirection[2],
+                           const float bStart[2],
+                           const float bDirection[2],
+                           float *time1,
+                           float *time2);
+
+Calculates the intersection time between two rays.
+
+The parameters I<aStart> and I<aDirection> describe the first ray.
+
+The parameters I<bStart> and I<bDirection> describe the second ray.
+
+The parameter I<time1> describes the resulting intersection time of the first 
+ray.
+
+The parameter I<time2> describes the resulting intersection time of the second 
+ray.
+
+If successful, the function returns 0, otherwise it returns an error code.
+
+
+=head2 BH_Ray2fIntersectRay
+
+ int BH_Ray2fIntersectRay(const float aStart[2],
+                          const float aDirection[2],
+                          const float bStart[2],
+                          const float bDirection[2],
+                          float *t,
+                          float out[2]);
+
+Checks the intersection between two rays.
+
+The parameters I<aStart> and I<aDirection> describe the first ray.
+
+The parameters I<bStart> and I<bDirection> describe the second ray.
+
+The parameter I<t> describes the resulting intersection time of the first ray.
+
+The parameter I<out> describes the resulting intersection point.
+
+If successful, the function returns 0, otherwise it returns an error code.
+
+
+=head2 BH_Ray2fIntersectSegment
+
+ int BH_Ray2fIntersectSegment(const float aStart[2],
+                              const float aDirection[2],
+                              const float bStart[2],
+                              const float bEnd[2],
+                              float *t,
+                              float out[2]);
+
+Checks the intersection between a ray and a segment.
+
+The parameters I<aStart> and I<aDirection> describe the ray.
+
+The parameters I<bStart> and I<bEnd> describe the segment.
+
+The parameter I<t> describes the resulting intersection time of the ray.
+
+The parameter I<out> describes the resulting intersection point.
+
+If successful, the function returns 0, otherwise it returns an error code.
+
+
+=head2 BH_Segment2fIntersectLine
+
+ int BH_Segment2fIntersectLine(const float start[2],
+                               const float end[2],
+                               const float line[3],
+                               float *t,
+                               float out[2]);
+
+Checks the intersection between a segment and a line.
+
+The parameters I<start> and I<end> describe the segment.
+
+The parameter I<line> describes the line.
+
+The parameter I<t> describes the resulting intersection time of the segment.
+
+The parameter I<out> describes the resulting intersection point.
+
+If successful, the function returns 0, otherwise it returns an error code.
+
+
+=head2 BH_Segment2fIntersectSegment
+
+ int BH_Segment2fIntersectSegment(const float aStart[2],
+                                  const float aEnd[2],
+                                  const float bStart[2],
+                                  const float bEnd[2],
+                                  float *t,
+                                  float out[2]);
+
+Checks the intersection between two segments.
+
+The parameters I<aStart> and I<aEnd> describe the first segment.
+
+The parameters I<bStart> and I<bEnd> describe the second segment.
+
+The parameter I<t> describes the resulting intersection time of the first 
+segment.
+
+The parameter I<out> describes the resulting intersection point.
+
+If successful, the function returns 0, otherwise it returns an error code.
+
+
+=head2 BH_Ray2fIntersectBox2f
+
+ int BH_Ray2fIntersectBox2f(const float aStart[2],
+                            const float aDirection[2],
+                            const float bMin[2],
+                            const float bMax[2],
+                            float *t,
+                            float out[2]);
+
+Checks the intersection between a ray and a bounding box.
+
+The parameters I<aStart> and I<aDirection> describe the ray.
+
+The parameters I<bMin> and I<bMax> describe the bounding box.
+
+The parameter I<t> describes the resulting intersection time of the ray.
+
+The parameter I<out> describes the resulting intersection point.
+
+If successful, the function returns 0, otherwise it returns an error code.
+
+
+=head2 BH_Segment2fIntersectBox2f
+
+ int BH_Segment2fIntersectBox2f(const float aStart[2],
+                                const float aEnd[2],
+                                const float bMin[2],
+                                const float bMax[2],
+                                float *t,
+                                float out[2]);
+
+Checks the intersection between a segment and a bounding box.
+
+The parameters I<aStart> and I<aEnd> describe the segment.
+
+The parameters I<bMin> and I<bMax> describe the bounding box.
+
+The parameter I<t> describes the resulting intersection time of the segment.
+
+The parameter I<out> describes the resulting intersection point.
+
+If successful, the function returns 0, otherwise it returns an error code.
+
+
+=head1 SEE ALSO
+
+L<BH>