Revenant Buffs and Nerfs

@s0apt0ken I think bolstering his kit regarding his silence and movement would be good. Also if I may suggest that his tactical maybe makes silenced players give an audible ping kind of how you can hear bloodhounds while they're in their ultimate. Wouldn't be too OP because it would require a decent amount of coordination to still find the silenced player. That, opposed to seeing silenced players through obstacles. Since I don't play him though I don't know if it doesn't already do that. I know it gives a screen effect and noise on the receiving end.