[FNA] "ASCII text" File Format - Graphics, Take 2

I didn't realize the last pull request included some files in exempt subdirectories.
Merge pull request #164 from 3vi1/monogame-sdl2

[FNA] "ASCII text" File Format - Graphics, Take 2
Remove exec properties from source files
Mouse cursor visibility fix, mostly for OSX
Turns out this was just a dumb OnEvent issue I made, IGNORE MEEEEE
removing unused defs for files in ./
cleaning up if SDL2 checks and removing an empty method
Merge pull request #165 from extrahotchilipowder/monogame-sdl2

removing unused defs for files in ./
One more def.
This is now just a configurable option.
Will be writing a lot of these!
[FNA] FNA Code Style - Storage directory
FNA License Cleanup for ./
Merge pull request #167 from khbecker/monogame-sdl2

FNA License Cleanup for ./
More unused MonoGame files
Mass license cleanup
LzxDecoder license cleanup
Actually, FNA license does not apply there.
Moar license cleanup in README
Additional code style updates.

Mostly spacing and comment sanitization.