[mage] Frost Frostfire Cleave update

[wingsco]

Changes in 2t Cleave

• Found a simplification for the Flurry line that also allowed to throw out Blizzard entirely for all builds
• Made an adjustement to the Ice Lane line to not force the boltspam gameplay onto all builds in Cleave (this change is roughly a -0.5% ish loss for ff builds that do have boltspam talents, but completely neutral for builds that dont - and much less cringe to play)
• Adjustements to ice nova priority to get another +0.5% to +1.1% gains against freezable targets for all profiles
• Adjustements to Shifting Power line to simply make it consinstent with the single target rotation (dps neutral)
• Small simplification for Ray that is only a very tiny loss