v0.0.16: Friends playtest fixes

The game is now called Firnreach
Build your Base first: other towers unlock once the team's Base is down
Mouse sensitivity default lowered, with finer 0.1 steps in Settings
Pause menu BROWSE: hover build cards and read tooltips while paused
Clicking a rock in commander view now mines exactly that rock
Animated Ice Brawler and Glacial Runner with readable attack wind-ups
New in the Hollow: Sealed Gate, lift room, records wall, abandoned passage, ice, street furniture and clearer station signs
First-win bonus; leaving a match counts as a loss; easier start on Easy
Key rebinding and accessibility options; new combat effects, snow and boss looks
Fixes: Hollow-return crash, memory leak, stuck bodies, Heartstone kiosk walk