Rotate the player model approprietly based on motion

[lobau]

face rightward when moving
only face enemy when engaged in combat

[lobau]

Based on our conversation, here are the two approaches:

The simplest, acceptable approach is:

• Dots always faces the door
• Dots turns toward the enemy it's attacking
• After combat, stay rotated until the next move, where it faces the door again

The more desirable, more sophisticated approach:

• when the player tap on a tile, the movement gets decomposed in one-cell steps
• for each step, Dots move to an adjacent cell, and pause for something like 300ms
• Dots orients its back towards the previous tile
• When attacking, Dots reorients towards the attacker

The second approach, while more complex, will make the game a bit nicer to play and allow for positioning strategies, like flanking or backstabbing damage

cc @christianv78 for viz