Major Changes Inv tabs and Inv functionality

Add the Character Tab to the Inventory. The Character tab displays the
Hero's equipped gear, and allows you to individually select each item to
view its stats. Also provides you with a total stat pool of each stat.
ALSO: Add the ability to close the Inventory/Character screens by
pressing either ESC, C, or I. Also added the functionality to pull up
the Character Tab by pressing C.
NOTE: Cosmetics need to be worked on...