Blank stage adds. Thinking about how best to do this. Probably a good time for a break =)
Refactoring spawn logic! Initial spawning works again, needs timers and some testing (gathering?)
Gathering works.

- Some items don't seem to be parsing:  something's broken somewhere...
- Capacity is not checked when spawning
- Spawn timer is never started or stopped =)
Items weren't being trimmed. I'd rather fix that in code, honestly...

- Capacity is not checked when spawning
- Spawn timer is never started or stopped =)
Items spawn on a timer (a random one... sort of).

- Capacity is not checked when spawning
Capacity works! Item spawning successfully ripped out into its own thing. Fixes #267
Adding the first bit of the info block - money tracker

Hud still needs:
- time tracker
- notification box
- options button
Info block is complete =) Fixed a few bugs with layering. Will see if there's more with clickable things.

Hud still needs:
- notification box
- options button
Fixed ordering. Adding in options button and screen next

Hud still needs:
- notification box
- options button
Options screen exists, but needs listeners/wiring

Hud still needs:
- notification box
Resume button works

Options screen needs wiring:
- save and resume
- save
- main menu

Hud still needs:
- notification box
Mid-game Options screen complete.

Hud still needs:
- notification box
HUD is working! Fixes #329