Implemented KDTree, did lots of tests, improved circle-triangle intersection algorithm, started hashmap for results
BIG MERGE; Please check if your changes are still there
MERGE
Merge branch 'master' of https://github.com/happah-graphics/happah

Conflicts:
	happah.pro
	src/main/core/SceneManager.cpp
	src/main/core/geometries/InvoluteSpurGear.cpp
	src/main/core/simulations/WormGearGrind.h
	src/main/glew.c
	src/main/gui/gl/DrawManager.cpp
	src/main/gui/gl/GlViewport3D.cpp
	src/main/gui/qt/MainWindow.h
	src/main/gui/qt/Tool.h
	src/main/gui/qt/ToolSelector.h
	src/main/test/WormGearGrindTest.cpp
	src/main/test/WormGearGrindTest.h