NPCs

I added the (four) hirable NPCs previously, but they were badly broken in the game.  After a fair amount of debugging, they are pretty much working now:

You hire them in town, and they manifest once you descend into the dungeon.

Additionally, I added the option to disable the Tooltips I'd mentioned earlier to the configuration, fixed a bunch of miscellaneous bugs regarding Inn events.  I should mention that every creature in this game can gain XP and levels, and the NPCs can as well (which is good, as you don't get XP for what they kill.)

Some interface updates

Still busy with checking through the full game, but as I started to do that, I realized parts of it were really just... a hassle.  So I added some ability buttons, so you can remember what the number keys are mapped for, and icons for the status ailments.

Then, after some thought about the icons not being very obvious, I added some tooltips to all of it.  They don't seem very intrusive, but I suppose I should add an option to disable them in the preferences at some point.