[mr3082] Hardcode some achievement id (don't complete "First on server" achieves for GMs)
[mr3083] Improve "First on server" achievements. Use flags instead of hardcoded ids.

thx to Dramacydal for idea.
[mr3084] rework lock chain and references counter in TerrainInfo part 2 v0.2. requires previous changes in TerrainMgr && TerrainInfo.
- use refcounted autoptr instead of grid counter matrix. remove some locks.
[mr3085] remove overlock from ObjectGridLoader::Visit (by valgrind check).
Revert "use MangosR2_Mutex in ALL R2 internal locks. VERY DANGEROWS!"

This reverts commit 31beed26cb163fd7e590c7b30453731da0da5beb.
Merge branch 'master' into testing