v0.23

With a few things from dev stream today.

- Mana beast's HP has been doubled again
- Mana power now increases every 4 floors, allowing you to gain one additional spell level (was 8).  Status screen now reflects this instead of just showing 8 all the time.
- Spells level four times as fast as in vanilla
- Fix Phanna gold costs for "really hard" mode

"Hard" may be too easy now?  I was able to go through an 8 floor one without much trouble.  We'll see in time if it still needs to be rebalanced.

Link