FR: Cache File Type Extentions

[SpoOkyMagician]

I discussed this on IRC and while it's only a windows things, I recommend having something as the file extension for the cache. In windows, it's just a garbled mess. (By Default, they are "file") I recommend ending it with something like...

.cache
.cach
.cah

or something along those lines. (Preferable a 3 character ending. Which is the standard for Windows.)

[tertu-m]

there's no reason that windows has to have 3-character extensions, you could do .sm5-cache if you wanted

[concubidated]

Should be a super simple change, but is there really any reason though? This shouldn't even be a directory users should have to go into at all.

Something like this in Song.cpp

std::string Song::GetCacheFilePath() const
{
	return SongCacheIndex::GetCacheFilePath( "Songs", m_sSongDir+".cache" );
}

Didn't look if anywhere else would need it.

[concubidated]

Closing, either PR will get merged or not.