Refactor bigints, add int and float conv functions

Added functions to convert from/to ints/floats. Floats are converted
according to basic Steele&White algorithm (without speedup).

include/BH/String.h

@@ -5,4 +5,88 @@
 #include "Common.h"
 
 
+void BH_StringFree(char *string);
+
+
+char *BH_StringCopy(const char *string);
+
+
+char *BH_StringFromDouble(double value,
+                          char format,
+                          int precision);
+
+
+double BH_StringToDouble(const char *string,
+                         size_t *size);
+
+
+char *BH_StringFromInt8s(int8_t value,
+                         int base);
+
+
+char *BH_StringFromInt32s(int32_t value,
+                          int base);
+
+char *BH_StringFromInt64s(int64_t value,
+                          int base);
+
+char *BH_StringFromInt16s(int16_t value,
+                          int base);
+
+char *BH_StringFromInt8u(uint8_t value,
+                         int base);
+
+
+char *BH_StringFromInt16u(uint16_t value,
+                          int base);
+
+
+char *BH_StringFromInt32u(uint32_t value,
+                          int base);
+
+
+char *BH_StringFromInt64u(uint64_t value,
+                          int base);
+
+
+int8_t BH_StringToInt8s(const char *string,
+                        size_t *size,
+                        int base);
+
+
+int16_t BH_StringToInt16s(const char *string,
+                          size_t *size,
+                          int base);
+
+
+int32_t BH_StringToInt32s(const char *string,
+                          size_t *size,
+                          int base);
+
+
+int64_t BH_StringToInt64s(const char *string,
+                          size_t *size,
+                          int base);
+
+
+uint8_t BH_StringToInt8u(const char *string,
+                         size_t *size,
+                         int base);
+
+
+uint16_t BH_StringToInt16u(const char *string,
+                           size_t *size,
+                           int base);
+
+
+uint32_t BH_StringToInt32u(const char *string,
+                           size_t *size,
+                           int base);
+
+
+uint64_t BH_StringToInt64u(const char *string,
+                           size_t *size,
+                           int base);
+
+
 #endif /* BH_STRING_H */

include/BH/Util.h

@@ -5,6 +5,24 @@
 #include "Common.h"
 
 
+#define BH_FP_NORMAL    0x0000
+#define BH_FP_INFINITE  0x0001
+#define BH_FP_NAN       0x0002
+#define BH_FP_ZERO      0x0010
+#define BH_FP_NEGATIVE  0x0020
+
+
+/**
+ * Classifies the floating point \a value.
+ *
+ * \param value  Value
+ *
+ * \return On success, returns BH_FP_NORMAL, BH_FP_ZERO, BH_FP_INFINITE,
+ *         BH_FP_NAN or BH_FP_NEGATIVE.
+ */
+int BH_ClassifyDouble(double value);
+
+
 /**
  * Reads 16-bit unsigned integer from the \a buffer in little-endian format.
  *