Moved levels to era folder, removed extra files
Fixed enemy waypoints, missing components

Fixed - The king doesn't show up
Fixed - The game crashes when the mage shoots
Moved IDamageable into Target

Anything that can be targeted can also be damaged.

Squads are no longer targets because they can not be targeted
individually. This removes the need to explicitly ignore squads when
checking for valid targets.
Removed ProgressBar from King Unit

The king's health bar is better reflected as a global game state so that
all relevant classes are able to access its value.
Fixed MageWaypoint, balance changes

Fixed - Enemy squads heading to the mage tower are getting stuck on the
wall.
Added health bars to towers
Added swordsman movement animations
Moved Unit animation logic into function
Fixed typo
Updated public variable name

Matches coding convention
Added damage states on towers