More Skill Tree Goodness

The skill tree is starting to shape up. Here's what the current build looks like...

I've added dependency information (albeit in a kinda hacky file format), and a "tab bar" of different trees. Each tree is read from a different file, and can contain any number/configuration of different skills.

Here's the confirmation dialog I mentioned from last post...

The spellbook ('z') now takes its cue from the skills the player has taken, with a few skills that provide spells already created. I need to add skills that provide improvements in spells, ones that passively increase stats, and ones that allow the use of certain equipment.