New game - Breakout!

As voted by the community, this was the next most popular game to be implemented.

Limitations:
 - No multiplayer support (yet)
 - Needs play testing

v0.28.1: Move paddle (no longer obstructed by fingers)
v0.28.2: Slower ball, room for combos above bricks

Be sure to note any feedback on GitHub, and support further development via donations on Liberapay or GitHub Sponsors.
