Add Unicode tests, fix whitespace, fix docs

Added Unicode tests (and fixed few bugs), changed whitespace script to
proccess markdown files, added new guide to showcase how to work with
Unicode.

README.md

@@ -9,6 +9,9 @@ Here is a short list of implemented features:
 - Abstraction over input/output
 - Basic data structures and algorithms (hashmap, queue, heaps, partitions)
 - Geomtric primitives (vectors, matrices, quaternions, rays, boxes)
+- Thread support functions and structures (thread, mutex, cv, atomics, etc.)
+- Unicode support functions (BMP, UTF-8, UTF-16, UTF-32)
+- String conversion from/to numbers
 
 For more information about currently implemented and planned features checkout
 [this page](doc/Features.md)