0.3.6

Webmon 0.3.6: time budget for memory clean-ups

• A voxel town makes ~100 MB of garbage a second, so the 48 MB growth rule
  forced a 650-950 ms full collection about every second (log: 1-2 fps,
  9-14 s of 15 spent in clean-ups). Forced clean-ups may now take at most
  5% of play time (a 900 ms one waits 18 s); Lua's incremental collector
  runs in between. Near the critical level they still run every 5 s
• Log: Lua heap beside the process size in clean-up and perf lines
• Bridge test covers the budget and the critical bypass