Attach event listeners to canvas whenever possible #112
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Hi. This pull request attaches event listeners in the setup code to the canvas element instead of the window element whenever possible. This hinders the listeners from interfering with the rest of the page and also removes the need to check whether the emitter of an event is indeed the canvas. Also, this pull request refactors the keyboard and mouse listeners to (hopefully) aid readability. However, I haven't tested the refactored code, so this pull request should not be merged yet.