Schematic component library object code cleaning and refactoring.

* Break classes_body_item.cpp(.h) into more reasonable size bites.
* Rename classes_body_item.cpp(.h) to lib_draw_item.cpp(.h)
* Fix some unsatisfied header file dependencies.
* Add stubs to component library draw item base classe to handle editing
  internally.
* Lots of code cleaning.

bitmap2component/bitmap2component.cpp

@@ -154,7 +154,7 @@ void ArmBoolEng( Bool_Engine* aBooleng, bool aConvertHoles )
      *    Another scaling with Grid is applied on top of it to create space in the integer number for
      *    even smaller numbers.
      */
-    int GRID = (int) 10000 / DGRID;       // initial value = 10000 in kbool example
+    int GRID = (int) ( 10000 / DGRID );    // initial value = 10000 in kbool example
 
     // But we use 10000/DGRID because the scalling is made
     // by DGRID on integer pcbnew units and