fixed some clang specific errors/warnings
fixed main (for SDL_main)
fixed mingw compiler-error
SDL_main workaround
windows-linker workaround
Merge branch 'dev' of ssh://git@github.com/lowkey42/magnumOpus.git into dev
fixed typo
made maybe mutable
added window-code
maybe fixed maybe-error
maybe fixed maybe-error V2
GLDEBUGPROC
GLAPIENTRY
Nun ausfuehrbar unter Windows x86/x64 Systemen mit MinGW32

folgende Dateien müssen entsprechend eingefuegt werden:
(ausgehend MinGW-Root)

.\lib\libSDL2.a  .\lib\libSDL2.dll.a  .\lib\libSDL2.la
.\lib\libSDL2_test.a  .\lib\libSDL2main.a
.\lib\libglew32.a  .\lib\libglew32.dll.a

.\include\SDL2
.\include\GL

.\bin\SDL2.dll
.\bin\glew32.dll

Die gelisteten Dateien müssen für den Mingw32-Compiler maked sein
My hands are typing words
Wrapper-classes for shaders & textures
added basic AssetManager-Skeleton