Android Release + UI improvements

• As you add reinforcements, they now show up next to the country's number of units for clarity.

• There is a small delay before you can make a second input, this is to avoid issues on mobile where a single touch was registering as multiple inputs.

• The UI buttons like "reroll spawn", "end reinforcement", etc have all been made much bigger.

• There is a movement animation between the country doing the attacking and the country being attacked to make the attack more clear.

• The game now gracefully handles different resolutions. The viewport is still rendered at 1080p, but it is shrunk to fit the display. No stretching, aspect ratio is maintained, so black bars are present.

• Made the sprite symbols larger. Red is an X, blue is a square. The size increase is for visibility on mobile.

• Game now runs in full screen mode, which avoids texture resizing on desktop.

• Added the tween node for smooth linear motion.

• Made some progress on AI.

• Fixed bug where removing a reinforcement was permanent.

• Movement of countries is synchronized across the network.