Increase indent and sort keys for saving player fleet.
Implemented commands (attack, move, boost) to be used by player and AI.
Removed the dependancy between Command and Battle classes.
Started to implement a basic IA

Basic IA tries to attack any ship in range, then moves randomly and after
moving, if it didn't attack, it checks again if any targets are in range.

Also added more info for ship damage or destroyed. Still needs to add info
for all messages and use colors.
Added color to some info messages.