Introduce Shapelock (#480)

* Introduce shape lock

* Format code with prettier

* Do not reset elementLocked on selection change

* Don't set isSelected to true if element is locked

* Don't reset the cursor

* Move reset cursor call to better spot

* Run prettier + lint

src/components/ToolIcon.scss

@@ -43,7 +43,8 @@
   }
 }
 
-.ToolIcon_type_radio {
+.ToolIcon_type_radio,
+.ToolIcon_type_checkbox {
   position: absolute;
   opacity: 0;