UI menu now accepts mouse input from absolutes.

src/dawn/state/StateProperty.hpp

@@ -80,6 +80,28 @@ namespace Dawn {
         return *this;
       }
 
+      StateProperty& operator++() {
+        this->setInternal(_realValue + 1);
+        return *this;
+      }
+
+      V operator++(int) {
+        V temp = _realValue;
+        this->setInternal(_realValue + 1);
+        return temp;
+      }
+
+      StateProperty& operator--() {
+        this->setInternal(_realValue - 1);
+        return *this;
+      }
+
+      V operator--(int) {
+        V temp = _realValue;
+        this->setInternal(_realValue - 1);
+        return temp;
+      }
+
       const V operator->() const {
         return this->_realValue;
       }