Fixed bug with player unit auto-moving on next turn when direction button is pressed during first menu display.
Fixed bug with menu button not displayed relative to canvas (was drawn relative to game). Fixed minor bug with player unit's movable tiles updating to new position when turn has not ended yet. Minor code cleanup.
Scaled terrain.png to 32px height. Modified battlefield map with terrains tileset.
Implemented player unit movement usage based on terrain. Fixed bug with units not registering correct terrain.
Merging with master