Servers: Fix some code style issues in world and authserver
Servers: Enable UseProcessors and ProcessPriority settings to be used on Linux
Servers: Fix typo
Docs: Prettify README

Thanks to Guybrush for the help
Scripts/DrakTharonKeep: reworked InstanceScript
Scripts/DrakTharonKeep: Update King Dred to use events

Closes #10385

Signed-off-by: joschiwald <joschiwald@online.de>
Misc: Fix warnings and build

Closes #10396
Merge branch 'master' of github.com:TrinityCore/TrinityCore into 4.3.4

Conflicts:
	src/server/scripts/Spells/spell_dk.cpp
	src/server/scripts/Spells/spell_priest.cpp