rotation initialization to zero

src/control/tools/EditSelection.h

@@ -231,7 +231,7 @@ private: // DATA
 	 */
 	double x;
 	double y;
-	double rotation;
+	double rotation = 0;
 
 	/**
 	 * The size

src/control/tools/EditSelectionContents.h

@@ -143,7 +143,7 @@ private:
 	/**
 	 * The given rotation. Original rotation should always be zero (double)
 	 */
-	double rotation;
+	double rotation = 0;
 
 	/**
 	 * The offset to the original selection

src/undo/RotateUndoAction.h

@@ -36,5 +36,5 @@ private:
 	double y0;
 	double xo;
 	double yo;
-	double rotation;
+	double rotation = 0;
 };