Making Mercy universally viable- a rework

[Qwazi-2242]

I like FFirebrandd’s suggestions a lot more (and think they are more balanced):

Low impact Mercy Rework

With this rework, I am attempting to shift her power to give her more decisions to make and make her feel more impactful without radically changing her power level or play style. Any items in her kit I do not mention remain the same. Full rationales behind each change will be written at the end. Also as normal, values are me spitballing. So… here we go. Mercy now heals her GA target for 15 HP whenever she uses it. Mercy’s E remains Resurrect, exactly how it is now on the live servers. How…