Fixed skybox being affected by previous materials
Fixed audio module not building
Nazara now prevent building with a C compiler
Added extern libraries (Made STB one of them)
Fixed warnings
Added Freetype extern library
Removed useless white lines
Remade build shortcuts
Added Lua extern library
Fixed lua not recognizing "!=" operator
Fixed lua.txt not being UTF-8
Lua is now compiled as C++

In order to use C++ exceptions instead of C longjmp/setjmp
Initializer now uninitialize in the inverse order
Merge remote-tracking branch 'upstream/master'