Sketcher new Feature: Creation Mode of geometry

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It allows to select whether the geometry will be created as construction geometry or normal geometry.

This commit includes an important bug fix to reduce the number of times the sketcher solver is called when toggling
geometry. It makes an important difference in the creation during construction mode and InternalAligment geometry like the ellipse.

This commit does not include icons.

You have a button next to toggle that after having been clicked, switches from Normal to Construction geometry and vice versa

src/Mod/Sketcher/Gui/Workbench.cpp

@@ -177,6 +177,7 @@ inline void SketcherAddWorkbenchGeometries(T& geom){
             << "Sketcher_Trimming"
             << "Sketcher_External"
             << "Sketcher_ToggleConstruction"
+            << "Sketcher_GeometryCreationMode"
             /*<< "Sketcher_CreateText"*/
             /*<< "Sketcher_CreateDraftLine"*/;
 }