Test build: seamless co-op with BBSC 0.0.2 (#17)

Test build for #17. Not a release: the launcher does not offer it as an update. It is 0.51-linux.15 plus BBSC 0.0.2, waiting for testing.

Seamless co-op: BBSC 0.0.2. CLS_AMG's latest BBSC, ported to Linux. Everyone in a session needs 0.0.2 (Windows players: BBSC's 0.0.2 release).

• A guest stays with the host that rang its sign, even with many hosts on the server.
• While you are dead in co-op, the camera follows a partner: Tab, E or left click for the next hunter, Shift+Tab or Q for the previous one, F for a free camera, F1 to turn it off until your next death. On a controller, R1/L1 and the sticks.
• The kit's bells ring anywhere, the Hunter's Dream included (BBSC settings → Bells anywhere).
• The guest sees the host's time of night.
• Fewer messages and bloodstains per area, against the "Panic 265" crash; fixes for kicks after a boss kill and for the guest's drops.
• A short timeline of each game in ~/.local/share/bbport/user/bbsc/logs/bbsc-timeline-*.txt.

What would help:

1. Seamless co-op on Seamless Hunt, with the Linux player as the guest (Kin Bell) and a Windows player on BBSC 0.0.2 hosting (Hunt Bell). Then the other way round.
2. Dying in co-op: the camera follows your partner, and comes back when you respawn.
3. The bells in the Hunter's Dream.

Please attach the game's log (launcher → Log → Export) and the BBSC logs (~/.local/share/bbport/user/bbsc/logs/, the bbsc-mod-*.log and bbsc-timeline-*.txt of that session) to the issue.

SHA-256: 5f55539f9a8b66f7d216f77c4c625a6be66cd9214e6c73ca125c421e58813ebb