Add support for burning ground from Essence of Hysteria

[Regisle]

edit : this the 2 lines below are no longer relevant

Built ontop of #4820
So most changes are from there, this needs a bit more testing before it can be added, and I will fix commits once the other PR is merged

Burning ground added does not use skill cfg, so modifiers to the skill do not apply but global mods do apply, will correctly override any other burning ground the skill has if its larger, and correctly works with full dps as well

need to test if its correctly isolated from the skill

[Nostrademous]

@Regisle you shouldn't check in code with ConPrintf() statements in the code. Will clutter up our console.

[Regisle]

@Regisle you shouldn't check in code with ConPrintf() statements in the code. Will clutter up our console.

my bad musta been half asleep, thought I removed those thanks

[QuickStick123]

This could use a breakdown but It doesn't belong to any skill so I don't know where it would go the calculations are fine though and interacts correctly with other burning ground.

[Wires77]

I think this and decay should probably be refactored into a generic method, but this looks okay for now.