New Features

Proper two player Dock support
- Supports two controllers connected to the Analogue Pocket Dock
- Since Dock and Controller 2 cannot currently be detected, by default Controller 1 will still be able to control Player 2's paddle. The "Use Ctrl 2 for P2" disables Player 2 controller on Controller 1, but this also prevents two people from playing on a single, undocked Pocket.
Fine movement controls
- By using the Pocket's trigger buttons, you can now more finely adjust the position of your paddles, allowing for more skilled gameplay
New default "Prevent coin reset" setting
- By default, inserting a coin will restart Pong, even if you're in the middle of the game. This setting prevents inserting a new coin until the game has completed

Fixes

Flipped the Pong arcade icon to match that of the other openFPGA cores (thanks to @ericlewis)
Made the video code slightly more readable