[FNA] #146 adding regions to Graphics/Vertices/
[FNA] #146 adding regions to Graphics/PackedVector/
[FNA] #146 adding regions to bottom half of Graphics/ folder (RenderTargetBinding-Viewport)
[FNA] #146 adding regions to a few more Graphics/ files (ModelMesh - RenderTarget2D)
[FNA] #146 adding regions to the remaining Graphics/ files (DirectionalLight-ModelEffectCollection)
[FNA] #146 removing extra lines before first, after last region. plus regions for a couple files i missed before
[FNA] #146 trying to undo my accidental tabbing change
Merge pull request #171 from extrahotchilipowder/monogame-sdl2

[FNA] #146 adding regions to Graphics/*