Enabled the VAO and backface culling in preparation for 3D
3D orthographic prism, Chapter 4 part 1
Added manual perspective projection

Part 2 of chapter 4
Switch perspective transformation to a matrix

Added compensation for aspect ratio
Merge branch 'Chapter4'

Conflicts:
	ArcSynthesisTut/Program.cs
	ArcSynthesisTut/bin/Debug/ArcSynthesisTut.exe
	ArcSynthesisTut/bin/Debug/ArcSynthesisTut.pdb
	ArcSynthesisTut/obj/Debug/ArcSynthesisTut.exe
	ArcSynthesisTut/obj/Debug/ArcSynthesisTut.pdb