{FIXED} Sprites Operational

Haha I forgot to put this back once I was done debugging! Hoorah!
Rearranged functions in World.cpp

No functional changes
This was just for my own sake/code readability
Removed Escorts
Implemented Factory Pattern

* Aircraft code is now significantly more lightweight
* Aircraft construction now only requires ShipType
Tested Factory Pattern on Escorts Successfully
Added Command Logic to Aircraft Constructor