Notes on Mesmerize edition:
* it's based on 17.22 (17.23 is the last vanilla version known to me, they are pretty similar tho).
* improved support for threat reduction items (mage and lock t3, Eye of Diminution)
* raid threat reset support (ony phase 2, azuregos, some naxx bosses)
* some minor threat calculation improvements (warr execute modifier, patchwerk hateful strikes, etc).
* lots of visual changes