Update Macro Icons

There are some icons that can only be assigned by going through the 4 pages of generic macro icons. As far as I know, these icons can not be set with the /macroicon command.

Newer icons are missing from this list. For example, we have the role icons for tank, healer, and DPS, but we don't have the sub-role icons (Melee DPS, Physical Ranged DPS, Magical Ranged DPS) or the generic all [roles] icon that we can see in places such as the party finder.

It would be nice to see some more of these kinds of icons made accessible to macro icons!

With healers getting "sub-roles" (ish?) it would be nice if icons for shielders vs pure healers could be made available in 6.0 or even 5.x (since the different capabilities already exist in the game).