[mr2910] correct LFG Reward for Utgarde Keep, related to sd2-177
[mr2911] Fix crash in Spell::CheckTarget() if target is Corpse, close #1383
[mr2912] Fix Quest 27061 (spell 47939)
Remove obsolete spell_dbc data.
[mr2913] Fix Quest 12630 (spell 51866)
[mr2914] Fix Quest 12937 (spell 55804)
[mr2915] Fix spell 66181
[mr2916] Fix spell 67322
[mr2917] Fix Glyph of Mirror Image
[mr2918] add templated instances for CheckCast (currently - only for error search). testing.
[mr2919] some more accurate check result of Spell::FindCorpseUsing, related to #1383
[mr2920] Correct log error.
[mr2921] Implement spell 70159.
Merge branch 'master' into testing
Reorganize R2 thread bucket manager, add templated class for possibility continue parallilize tasks. testing (no any changes must be currently). need check compile under win.