Core/Spell: convert more spells to SpellScripts
Core/Log: Allow configuring a maximum file size for a log file. If the file size is about to be exceeded, the core will create a new file titled <oldname>_.log and start outputting there.
Script/Commands: Add command to join an existing group/party.
Typo fix.
Merge pull request #9016 from joschiwald/spellscripts4

Core/Spell: convert more spells to SpellScripts
SQL: Rename SQL merged in PR
Core/DBLayer: Drop support for MySQL versions <5.1

Both server and client libraries must be up to date in order to run TC.
Scripts/Icecrown Citadel: Fixed Essence of the Blood Queen interrupting player spell casts

Closes #8665
Tools: Remove a bit of spam when mmaps_generator loads vmaps
Merge branch 'HEAD' of git@github.com:TrinityCore/TrinityCore.git
Tools/mmaps_generator: Multithreading optimisations. Should save some time generating mmaps.
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into TrinityCore-master

Conflicts:
	src/server/game/Entities/Unit/Unit.cpp
	src/server/scripts/Spells/spell_paladin.cpp
	src/server/scripts/Spells/spell_warrior.cpp