Patch #16 - Bug fixes and new features

Another patch with bug fixes but also some new features! 

• new feature: Be able to put one resource on the building and fill out that resource.
• new feature: Priority list for gatherers
• new feature: Add options menu to adjust volume etc
• Fixed bug: Builder can bug out if you hold an item they need
• Fixed bug: where enemies did'nt take damage
• Fixed bug: where enemies didn't spawn after a certain level
• Fixed bug: where enemies were invincible
• Fixed bug: Purple screen, texture not loading
• Fixed bug: where for some devices the screen would be black with pink squares