Add const to input of UCS2toUTF8
Fix wrong input variable usage on BasehangulEncodeBlock function
Implement BasehangulDecodeBlock function
Change Encoding tests names and file name
Add Decode test
Add function comments
Add decode test
Add input length argument to UTF8toUCS2 function
Fix wrong return - doesn't calc return - of BaseHangulEncodeBlock function
Implement BaseHangulDecode function