Update 2: Polishing and minor fixes

Just some minor changes to fix some things with Garden Witch. I promised a more careful, considered update, and here it is. Here's the changes:

-Fixed a bug to do with a missing effect prefab on Cold Spells

-Fixed an accidental bug that would cause the boss fight to not trigger.

-There is now a HUD effect that makes it more obvious when you're dead.

-Reworked the 'Stuck' reminder to be less obnoxious. Now it will only pop up after x time not trying to move.

-Reworked the HUD, which should now render way more reliably at non-4:3 resolutions

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