Fixed pressing ESC during unit action

ESC was not blocked during unit actions like right click is, this made it possible to execute a back action while the unit was mid action (moving or attacking etc). Overlapping action execution would result in a corrupted game state, causing various issues such as units to appear on incorrect tiles, become desynced from their sprites, and most likely crash the game during AI simulation.

This should hopefully fix some of the weird bugs that we have seen before but not been able to replicate!

Also updated victory screen backgrounds -> removed the white line on the right side.