Minor Update for Continue-It Jam III

Not much, as I was hoping to get more done, but life has a way of getting away.

Character Changes

•  Reduced the cost of Regal Gleam's `Brightsphere` ability from 4 to 2.
•  Reduced the cost of Regal Gleam's `Brilliant Grace` ability from 5 to 4.

User interface

•  Added a panel to show grid controls when not selecting a character.  (This isn't complete or perfect, but it does help out a lot.)

•  Cursor arrows will now drop if the targeted tile is empty.  (This helps convey the position of the cursor a lot better than before, as it would hover over empty space.)

Fixes

•  Poison Damage amount increased from 2 to 20. (This is where it was meant to be from the get-go, so this isn't a buff. That said, this does make Venom Kiss a much more potent character.)
• Fixed Shining Leaf's missing hurt audio
• Fixed an issue with moving to the next stage on Stages 3 and 4 after victory
• Fixed issue where Back Position range penalty wasn't being properly applied