[mt291] Fixed group invites
[mt292] Implement CMSG_SET_EVERYONE_IS_ASSISTANT
[mt293] CMSG_DISMISS_CRITTER handler

Signed-off-by: Yaki Khadafi <elsoldollo@gmail.com>
[mt294] Fix SMSG_TRAINER_LIST
[mt295] SPELL_EFFECT_DAMAGE_FROM_MAX_HEALTH_PCT & SPELL_EFFECT_RESURRECT_WITH_AURA
[mt296] Fix PLAYER_LOGIN_QUERY_LOADMAILEDITEMS
[mt297] Define SPELL_EFFECT_176 as SPELL_EFFECT_SANCTUARY_2
[mt298] Reimplement some aura interrupt flags
[mt299] Correct SPELL_EFFECT_FORCE_CAST_WITH_VALUE
[mr300] Implement profession skillgains != 1 (+2, +3) and fix profession skill gain.