Maps can now have multiple flying islands connected by bridges 🏝️

Maps can now have multiple flying islands connected by bridges 🏝️
This week in my little game experiment:
* Reworked river & waterfall flow
* Reworked how grass works
* Tweaked the hero model to fit the world better
* Added UT99-style dodging
* Added petting with mood-based buffs/debuffs
Gathered all my hero's animations in one place to see which ones need a little more work. They're missing a bit of context here, but the awkward poses have nowhere to hide ⚔️