reimplement Q_DISABLE_COPY_MOVE for full compatibility with versions < 5.13

I was under the impression Q_DISABLE_COPY_MOVE was a much older function than
it is. Since we historically target 5.6 and these functions are small
convenience functions, I just implemented them in the actual codebase.

app/common/constructors.h

@@ -0,0 +1,20 @@
+#ifndef CONSTRUCTORS_H
+#define CONSTRUCTORS_H
+
+/**
+ * Copy/move deleters. Similar to Q_DISABLE_COPY_MOVE, et al. but those functions
+ */
+
+#define DISABLE_COPY(Class) \
+    Class(const Class &) = delete;\
+    Class &operator=(const Class &) = delete;
+
+#define DISABLE_MOVE(Class) \
+  Class(Class &&) = delete; \
+  Class &operator=(Class &&) = delete;
+
+#define DISABLE_COPY_MOVE(Class) \
+  DISABLE_COPY(Class) \
+  DISABLE_MOVE(Class)
+
+#endif // CONSTRUCTORS_H