Another fairly small update to improve or fix a few

This version includes the following changes:

• Removed Artful Dodge as one of the Entertain abilities and added Funambolism in its place. Artful Dodge (which replaced the no-armour Dodge bonus with Entertain proficiency) always felt like a flavourless and generic ability which was nevertheless good enough that you probably had to pick it at some point. Funambolism is hopefully a bit more fun and character-defining.
• Replaced the Sound of Silence spell with Icy Tranquility. Sound of Silence was too similar to a tattoo of a Glyph of Silence, Icy Tranquility is hopefully a bit more unique and interesting.
• Tweaked the effects of a few spells, mostly to make the DL 2 spells more 'balanced'.
  • Control Water and Control Air have a bit more utility now.
  • Fling and Launch now use the result of the roll against the Target DL.
  • Traverse now inflicts a deadly wound on a failure instead of just killing you.
  • Great Winter deals more damage now.
  • Mass Levitate changed to any number of targets.

Coming almost certainly for-real-this-time in the next update:

• Dungeon rules, similar to how the settlement exploration rules work now.
• A ruins generator to help with exploration during travel (almost done).
• Rules for magical corruption/disease/vampirism (almost done).
• Magic item generation tables.