Add hero roles
Add hero roles

If a hero has a role designated by Blizzard then they have that listed.
Furthermore, if a hero can serve another role as well (E.G. Sgt. Hammer
as an "assassin") it has been added to their role. I erred on the side
of too many roles. This will allow us to apply multiple filters, E.G.
"melee", "sustain", "assassin" and see what heroes might fit the role.

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