Add Mouse and Keyboard support to the Canvas

[BlazingTwist]

I wasn't super sure where to insert the documentation, so I've just created a separate md file. canvas_input.md

Here is a minimal (ish) demo showing various interactive UI elements. (My Aya code quality is definitely suboptimal, I am very open for feedback)
canvasInputDemo.zip

More Demos

I've also "battle-tested" this during a CodeJam, if you're interested.

Interactive Fluid Simulation

Lock-Picking Mini Game

[nick-paul]

Adding keyboard+mouse input is something I've been wanting to do for a little while but never got around to it. This is a great implementation and the demos are very impressive. Thanks for working on these changes!

I like the functional style you used for many of the instructions. I need to brush up on those java features

Since there are no breaking changes, I'll probably release these soon in 0.3.2 (rather than later in 0.4.x)

Also, small note since I ran into an error when running the code on linux: for the import statements you should be able to use import "scenes.mode_select" instead of "scenes\\mode_select" importlib.import. The "dot" version should work on all platforms.