Added orbs

- Don't sync up with minimap yet.
- Also moved BlackFade to entities package.
Orb sync with map

- Not sure if I like the icon, I might change it from a plus to a
square.
- Logic is pretty spaghetti-like; I might fix that later.
Bug fixes, tweaks
Added green block effect

- Haven't yet made a property to determine which rooms have the effect.