* Comments and newlines in engine.go
* Comments and newlines in object.go
* Comments and newlines in animated_entity.go
* Comments and newlines in missile.go
* Comments and newlines in npc.go
* Comments and newlines in player.go
* Removed object.go (incorrectly merged it in during rebase).
* Comments and newlines in renderer.go.
* Comments and newlines in map_entity.go.
* Comments and newlines in walk_mesh.go.
* Comments and newlines in viewport.go and tile_cache.go.
* Comments and newlines in stamp.go and wilderness_tile_types.go.
* Comments and newlines in everything else.
* abstracted palettes, colors, and palette manager
* make asset manager use the palette manager interface
* added BGRA setter/getter, fixed lint errors
* abstraction for animation and animation manager
