Switch random function to std::mt19937

Added class EQEmu::Random
Functions:
EQEmu::Random::Int(int low, int high)
EQEmu::Random::Real(double low, double high)
EQEmu::Random::Roll(int required)
EQEmu::Random::Roll(double required)
EQEmu::Random::Reseed()

For zone, you will access the random object through the zone object
ex.
	zone->random.Int(0, 100);

Int returns a random int between low and high
Real returns a random double between low and high
Roll(int) returns true if Int(0, 99) < required is true
Roll(double) returns true if Real(0.0, 1.0) <= required is true

loginserver/client.cpp

@@ -389,7 +389,7 @@ void Client::GenerateKey()
 			'6', '7', '8', '9'
 		};
 
-		key.append((const char*)&key_selection[MakeRandomInt(0, 35)], 1);
+		key.append((const char*)&key_selection[random.Int(0, 35)], 1);
 		count++;
 	}
 }