Give Higher Regen To More Unique Units And Healers

While in legacy spahis had a higher than average 2% max hp regeneration with a 2 second lockout, in de every regen unit has a meager .25% with a 3.5 second lockout like explorers.

give units like dog soldiers, skull knights, urumi, all mansabdar and daimyo units, as well as non-hero healers like surgeons and missionaries the higher 2% max hp regeneration rate. perhaps imperial upgrades should also move hero healing to this amount as well, or have it auto upgrade with age.

also hovering over regen icon still does not show regen amount or lockout time, this should be fixed.