Change ControlState typedef to double, and change all related floats/doubles to use it.

Fixes an off by 1 issue related to double->float->double conversion, and eliminates numerous warnings.

Source/Core/InputCommon/ControllerInterface/ExpressionParser.cpp

@@ -273,7 +273,7 @@ public:
 		case TOK_OR:
 			return std::max(lhsValue, rhsValue);
 		case TOK_ADD:
-			return std::min(lhsValue + rhsValue, 1.0f);
+			return std::min(lhsValue + rhsValue, 1.0);
 		default:
 			assert(false);
 			return 0;