Graphical Overhaul

Warlock: Age of Entropy is getting a major graphical overhaul from ASCII graphics to top-down 16x16 sprites.  I tried to make this change without compromising too much readability.  There's a lot more going on now on the screen, and I'm open to comments about if any sprites are confusing or badly done.

With that said, here's the patch notes for changes to the latest version:

- Graphical overhaul

- Minor text corrections

- Added two new mobs 

- Added two new potions 

- Add some indication that floor 14 is the end of the game

- Made floor/wall easier to distinguish

- Fixed a bug that caused items in stacks to render in the wrong order

- Fixed a bug where blood from dead mobs would appear outside FoV

- Fixed a bug where glade wall would have grass texture 

- Fixed a bug where channeling mobs would have the wrong sprite when stunned out of their channel

- Fixed a bug where text for mob names would be cut off