Adds Waluigi to CIV 6!

Leader Passive:
Everybody's A Cheater:
+2 Spies

Nation Passive:
One Hell Of A Tennis Career:
+1 Range To Ranged Units

Unique Units:
Piranha Plant:
Melee/Ranged unit with reduced movement speed.
Cost: 200 Production/800 Gold
Melee Combat Strength: 40
Ranged Combat Strength: 20
Range: 1 (Becomes 2 with Nation Passive)

Waluigi Himeself:
Late Game Melee/Ranged unit.
Cost: 600 Production/ ? Gold
Melee Combat Strength: 120
Ranged Combat Strength: 60
Range: 2 (Becomes 3)

Unique Buildings:
Waluigi's Taco Stand:
Requires Commercial District
+3 Gold
+2 Food
+1 Culture
+1 Production
+1 Great Merchant Point