[SP] Cleanup Cmd_Args* functions.
Make Key_Bind_f use Cmd_ArgsFrom( 2 ) instead of generating its own buffer.
[MP] Merge cmd files into cmd.cpp.
Improve cmdlist functionality.
Add file buffer alias union.
[MP] CMake change for previous commit.
Merge branch 'master' of https://github.com/JACoders/OpenJK