Extract Locomotor component

[Silentor]

Implement separate Locomotor component, make 2 kinds of locomotors:

• small biped (1 block size, slow but good passability on rough terrains)
• medium wheeled (2 blocks size, fast on flat terrain but unable to pass steep slopes)

Navigator component should consider locomotor traits while planning route. Path should be cached for same locomotors (#103 )

[Silentor]

Mostly completed, left to add size property and use size in micropathfinding