Implemented some additional functionality to set a display size more comfortably. Also implemented a method to give the system the size of a video wall. It will do the resolution calculation by itself. Needs to be tested a lot before a merge.
Some more commentary, some more testing. Some little fixes.
Some cleanups and tests.
Improved the example and did some ui testing.
Merge branch 'feat_dsteffen_windowSizes' of https://github.com/FUSEEProjectTeam/Fusee into feat_dsteffen_windowSizes
Merge branch 'develop_lh' into feat_dsteffen_windowSizes
Little change in the example.
Implemented a method to close the gamewindow. So we can map this to different buttons and not just 'escape'. Now it is possible to use escape to close a menue etc. and not just to instantly close the app. Only problem: We might have to update existing projects with a call to the function as the normal hardcoded way in GameWindow is not working now.
Set up some kind of a test project for different audio files and loading methods to identify and reproduce  the bugs which were reported.
Some more changes for the audio testing in streaming and non streaming methods.
Fixed some little bugs so the window size is more reliable. This is needed because the width of the border seems to be substracted from the total pseudo fullscreen size.
Merge branch 'feat_dsteffen_windowSizes' into develop_lh