Nazgul units configure to work properly

[pulkit24]

Ideas:

• [x] Mg wraiths don't do ranged attack. Instead, they have a large radius splash damage of terror type, attack value 1. This will fit their screams being terrifying, while avoiding being OP. Update: only for Black Rider?
• [x] Make Ringwraiths do ranged attack to ranged units and melee to melee units using Unit Abilities and Villager Mode. Cancelled: didn't work.
• [ ] ~~Ring wraiths can kidnap? Is it possible to convert captured units to wraiths?
• [x] Ringwraith elite - area of effect damage (see Aura of Fear tech).
• [x] Alt Ringwraith solution: Mount/Dismount option from packed trebuchet, into Black Rider. Also auto-attack is ranged, targeted attack is melee? This way, Elite Ringwraith is now Black Rider, and the two Black Rider unit slots get freed. Cancelled: auto-attack is lost.

[pulkit24]

See: http://aok.heavengames.com/blacksmith/showfile.php?fileid=11446 for an implementation of ranged and melee combo.