Adjusted texture settings to accommodate sprite packing in Pro version

* Changed individual sprite settings and minimize number of individual groups.
* Changed a lot of GUI textures to sprites to allow packing.
+ Sprite Packer tags: Entities, Handrew, Patient, GUI and Effects.
+ Added a custom atlas packer policy that limits the atlases to 1024x1024 pixels.
- Removed a lot of assets that are no longer in use.