Wide strings Functions

This pull request implements four functions: towlower, towupper, wcsncasecmp, and wcscasecmp. The first 2 functions are building blocks for the last two, which in turn are required to compile binutils successfully.

marked as a Work In Progress

changed title from WIP: Wide strings Functions to WIP: Wide strings Functions (Please don't merge yet)

unmarked as a Work In Progress

changed title from WIP: Wide strings Functions (Please don't merge yet) to Wide strings Functions

merged

mentioned in commit c799dad4