New game - Breakout!

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

v0.28.3: Choose either on screen buttons or touch-to-drag for controlling paddle
v0.28.2: Slower ball, room for combos above bricks
v0.28.1: Move paddle (no longer obstructed by fingers)

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