Custom display stats

[Regisle]

This is a very technical change too make it easier to support custom display stats in the future

For now this allows users to save/load custom display stats to settings, though there is no UI to do so and thus requires users to add them manually, this PR is mainly meant to make it easier to add a UI in future to allow users to easily customise it

eg somthing like

<StatList>
		<statGroup index="1">
			<stat label="Total Life" displayStat="true"/>
			<stat label=" Total Life" minionDisplayStat="true"/>
			<stat label="Unreserved Life" displayStat="true"/>
			<stat label="Life Recoverable" displayStat="true"/>
			<stat label="Life Regen" color="^x7070FF" compPercent="true" displayStat="true" minionDisplayStat="true"/>
		</statGroup>
	</StatList>

looks like and gives percentage change when hovering over regen

the amount of data needed to be saved is reduced by the fact that most of the data is reused from the old display stats if the stat shares the same label, overriding any keys with ones saved in settings (as well as displayStat/minionDisplayStat/extraSaveStat)

[Regisle]

I really don't like the magic space character differentiating the stats. I see the problem you're trying to solve, but at the same time you're adding the space where it otherwise wouldn't have to exist (e.g. "Life Cost" being for LifeCost and LifePercentCost).

This is because there are a few stats which have different conditions for showing like "show average", or need different labels like "attack speed" and "cast speed", and I cant tinker with the stat, I could have kept reference to the index or a count of number of that stat or something, but all of those kinda references would break if we shuffled or added things, and I wanted it to be future proof, this leaves me with complex things like adding a number or tag and doing checks which endup way more complex than just adding a leading space which does nothing display-wise because its aligned by the end of the string not the start

Seems like there's a fine differentiator for most cases in "minionDisplayStat". For the few other duplicates, we could just add another property, most likely.

I do not want to differentiate by that becouse I want to allow people to add whatever stats they want to either player or minions, eg some people might want to see more defensive stats for minions, or something like chaos res was important when fleshcrafter was common

worst case is I can trim leading spaces when adding it to display/minion display