Add more graphics into the editor

[leveleditor]

• [ ] Sprite rotations for angles
• [ ] Outlines (for unit selection, instead of circles) (original concept: https://crystalien-redux.com/uploads/public/CAMM/Conceptual/Unit%20Selection%20Outline.png)
• [ ] Sprite animations (absolute lowest priority, no functional purpose)

Adding these graphics will require changes to the Config.json format: https://github.com/leveleditor/CAMM-Crystal-Alien-Map-Maker/blob/master/Crystal-Alien-Map-Maker/CAMM_Data/Config.json

[Brian151]

given i tend to do graphics things, i'll take care of preparing them wouldn't take too long, but this is still low-priority