[Suggestion] Implement MP thresholds for the healers

[Zeffuro]

Still thinking about if I want to make this default or not.

Already have code in place for DRK/BLM and PLD but these are currently not configureable. Would love to have input for what values we want default for healers.

    checkAndInitializeSetting(settings.manabar, "BLM", {});
    checkAndInitializeSetting(settings.manabar.BLM, "low", 2399);
    checkAndInitializeSetting(settings.manabar.BLM, "med", 3999);

    checkAndInitializeSetting(settings.manabar, "PLD", {});
    checkAndInitializeSetting(settings.manabar.PLD, "low", 3600);
    checkAndInitializeSetting(settings.manabar.PLD, "med", 9400);

    checkAndInitializeSetting(settings.manabar, "DRK", {});
    checkAndInitializeSetting(settings.manabar.DRK, "low", 2999);
    checkAndInitializeSetting(settings.manabar.DRK, "med", 5999);

[ChadRD]

The only thing I can think of for healers is a Lucid Dreaming threshold (50-70% depending on the player).

But, a slidecast bar for MP and a shield indication outlining the HP bar would also be useful.