Updated (nearly) everything for Dawntrail

[Enriath]

(Oh gee, yet another PR for updating to 7.0?)

I wanted some more practise with C# tooling, and also was missing XIVCombo, so here's basically everything updated!

The only things I've not touched was Warrior's Inner Release (and given glen-lee's PR, it's a much more complicated issue), Black Mage's Leylines (similar to Warrior, it's a more complicated issue imo), and Gunbreaker (mostly because I don't have access to the class as a trial player, and it was confusing me too much to try and figure it out in abstract).

I've tested every change to make sure it works, either by myself, or with a high level friend.

I wasn't too sure about submitting after I saw just how many different PRs there were, but I felt like most of them covered only a few jobs each. I've also organised my commits such that it'll be a lot easier to pull in a part that another PR missed; I hope that's useful.