'Ruthless' mode toggle to disable Onslaught movespeed & missing gems

[AnnanFay]

Check for duplicates

• [X] I've checked for duplicate issues by using the search function of the issue tracker

Is your feature request related to a problem?

Not really related to a problem

Describe the solution you'd like

Would be nice to have a toggle in configuration screen which when enabled modifies passive points and mechanics based on the differences Ruthless mode has. Not many at the moment, but might grow.

Main one I can think of is the loss of movespeed from Onslaught.

Would also be nice to filter the unavailable gems, 'Item Rarity Support' & missing movement skills.

Edit: Also reduce the number of available ascendency points to 6.

Describe alternatives you've considered

Could have a new branch of PoB, but probably not worth it as the mechanical differences betwene modes are really minor.

Additional context

No response