Add support for showing the mouse clicks - updated

Matthew Whiterequested to merge
mehw/screenkey:mouse into master

Based on MR !65 (closed). Patch adapted to work with the master branch. I didn't polish the code though.

If I'm not wrong, thanks goes to @zaygraveyard. I was looking forward for this functionality.

I'm opening this as a working reference for future development.

Feel free to amend the code.

Cheers!

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