SADXModLoader/ReadMe.txt: Remove MSVC's auto-generated ReadMe.
libmodutils: Actually add CMakeLists.txt, stdafx.cpp, and stdafx.h.

I keep forgetting to add files to the repository.
FileMap: Split most of the file map code into a separate class.

_ReplaceFile() still exists as a wrapper for asm code.

TODO: Port the bass code to FileMap.
dllmain.cpp::PlayMusicFile_r(): Updated to work with FileMap.

FileMap::findFileNoExt(): New function to find files that match a
given filename, sans extension.

TODO: findFileNoExt() is slow. Optimize this function.
FileMap::addReplaceFile(): Search for origFile_norm, not origFile.

The case where the destination file is replaced was correct;
the other case wasn't.
FileMap: Optimized no-extension file lookups using an unordered_map of forward_list.

The forward_list implements ordering by ensuring that the front of the
list has the most recently-added item.

The unordered_map's key is the normalized original filename, sans extension.

dllmain.cpp::PlayMusicFile_r(): Use fileMap.findFileNoExt().

BASS vgmstream still works, but file lookup should be a lot faster now.