Changelog v0.53b

The performance of pathfinder algorithm was improved
Overwatch zones was totally remade (do you like new zones?)
The cost of shooting now set by three buttons, hotkeys by default is "1", "2", "3".
Weapons was a little rebalanced
The randomisation of enemy start position was implemented. It's the first turn to implement difficulty options (easy, normal and hard).
As a consequence of the preceding point, the majority of the levels was improved