New Classes, fixes and gameloop

Added a couple playable classes:

• Rover - Ranged/tank hybrid, throws poisoned darts from afar but engages in melée combat. Can set up a CAMP to skip night-time and heal the party.
• Archon - Ranged magic missiles fighter, can RESURRECT one defeated ally every 2 minutes.
• Skinwalker - Cursed melée fighter that turns into a terrifying creature at night.

Added a few fixes and improvements:

• Full gameloop: all 11 Elemental crystals can be found
• The squad can be moved sideways with the Z and C keys
• Fixed some cases where landmarks could be spawned on a mountainside
• Some units may scatter targeting towards multiple targets instead of all focusing on the same one
• Redid the Scavenger's loot magnet, which was breaking if he got knocked back