Made Point a generic struct.
Restrict Point typeparam to primitive value types.
Begin work on UI controls.
Worked some more on the input classes, added events.
More work on UI classes.
Added IDrawable interface (Not used yet).
TriEngine2D project file update.
Added documentation comments to mouse event handler delegate definitions.
Added missing license info to TriDevs.TriEngine2D/Input/Events/Mouse.cs
Merge pull request #17 from Sharparam/patch

Several updates.