v4.1 — Minor bug fixes — SurLeFil Steam update #318266

A small round of fixes to smooth out the rough edges. • Leaving a room or activity is reliable again — no more freezing after the first exit, and a quick double-click won't trigger it twice. • Switching player profiles now drops you back at the right spot on campus, with no leftover state carried over from the previous profile. • Your score now updates correctly when you return from a mission. • Sealed a couple of gaps near the pond where you could slip off the island's edge. • Cosinus's pond finally has a visible way out — a little staircase, so nobody gets stranded down there. • Softened the campus exit music (the old one was a touch spooky). • Plus various small stability improvements under the hood.