Beta-0.7.2

Features:

• Collections: make and manage object collections

Fixes:

• replaced all tabs with a new TabGroup element that fixes the issue of tabs hiding behind other ui elements when the list is too big.
• fixed not being able to clone creatures
• replaced asset explorer toolbar with an actual Toolbar element
• fixed a major bug with scroll list elements that broke scrolling when vertical size changed
• added dropshadows to context menus and windows fix visibility