Scripts/Eye of Eternity: Fix Arcane Barrage handling and a lot other mechanics

* Nexus Lords had a bit imba timers on Arcane Shork, sorry for it wrong information. Now have retail timers.
* Scion of Eternity Arcane Barrage had wrong timers also for intial random cast and for each after. They were a bit lower.
* Implemented source mechanic that will always differ target of cast X to target of next cast. All rest is % chance based on various cases can happen.
* Removed condition for Arcane Overlaod bubbles now aura will never ("disappear"), if two are at one place they will override each other, but damage will never be leaked test enough times so don't bother stating opposite. Damage in ALL cases is reduced.
* Made Malygos range outside of platform a bit shorter to match retail real distance that also fixed timings of bubble mechanic, now they will always be there, if you are fast enough.
* And finally fixed some slight stuff on Malygos spell. Now all will work and Arcane Storm has it's correct visual mechanic again.

Closes #9321