Core/Auras: Implemented Aura::GetScriptByName.
Scripts/Onyxia's Lair: Fixed movement during flight phase and set proper InhabitType

Closes #10335
Scripts/Spells: backport some SpellScripts from 4.3.4 branch

- Fix Earth Shield
- Fix Necrotic Touch
- Fix Reflective Shield

Closes #9145, #9163, #9665
Merge pull request #10336 from joschiwald/spellscripts5

Scripts/Spells: backport some SpellScripts from 4.3.4 branch
Merge remote-tracking branch 'upstream/master'