Refactors package structure in preparation for ground units.
Implements initial version of ground targets.
Refactors Health components into a single health component and multiple status components.
Refactors weapon out of Jet component and into its own component.
Implements basic support for weapon selection.
Organizes imports.
Implements selecting ground targets and ground target highlights.
Moves activateWeapon intent to Jet state instead of Attack state.
Implements selecting ground targets and weapon switching.
Implements proper resetting of targets when weapons are switched to an incompatible type.
Implements cannons.
Implements a Unit component and unit type enum.
Refactors JetRadarSystem to operate on the unit component.
Adds the unit component to jets and the fleet.
Renames jet's concrete damage states.
Renames DamageJetSystem to DamageSystem.
Refactors damage system.
Fixes a few bugs.
Implements basic fleet death.
Fixes a bug with the fire animation and death.