* Added a (hacky) fix for a Java Swing/AWT + GLFW interaction issue…
… on Linux.
* Added a proper comment
* Added an extra call to System.gc() as recommendation from lwjgl’s @Spasi
"Run System.gc(), at least two times. Not sure how AWT handles native
resources, maybe there’s a finalizable/PhantomRef-ed resource that is not
released immediately, but a subsequent GC triggers a (too late) free. "
* Added key remapping for GLFW key constants
* Rename AppSettings.getGammaCorrection() to isGammaCorrection()
* Use LWJGL3 artifacts from maven
* Minor compatibility changes for LWJGL 3.0.0b
* Fixed some minor bugs in LwjglWindow
