[TD]Cosmetic function overhaul (#14216)

* [TD]Cosmetic geometry and tools update

- all cosmetics to store geometry in same form
- all cosmetics to survive scaling and rotation
- extension functions to survive scaling and rotation

* [TD]overhaul leader point storage and editing

- add py routine makeLeader(points)

* [TD]add leader conversion utility

* [TD]Set Leader RotateWithView default to true

* [TD]fix intersection vertex position

* [TD]add CosmeticEdge::makeLineFromCanonicalPoints

* [TD]fix 2 Extension tools

- positioning in DrawCosmeticCircle
- mishandling of points in execLineParallelPerpendicular

* [TD]Remove duplicate constexpr

* [TD]fix 2x Cosmetic arc tools

* [TD]refactor LineFormat out of Cosmetic

* [TD]move cosmetic appearance settings to LineFormat

* [TD]remove 2 unused methods

* [TD]apply format to blue line & circle tools

* [TD]fix ballon arrowhead does not rotate with view

* [TD]fix CosmeticCircle3Points

* [TD]allow multiple cosmetic object deletions

* [TD]fix extend/shorten centerline

src/Mod/TechDraw/Gui/PreferencesGui.cpp

@@ -296,3 +296,11 @@ QColor PreferencesGui::templateClickBoxColor()
     fcColor.setPackedValue(Preferences::getPreferenceGroup("Colors")->GetUnsigned("TemplateUnderlineColor", 0x0000FFFF));  //#0000FF blue
     return fcColor.asValue<QColor>();
 }
+
+int PreferencesGui::get3dMarkerSize()
+{
+    ParameterGrp::handle hGrp = App::GetApplication().GetParameterGroupByPath
+                                ("User parameter:BaseApp/Preferences/View");
+    return hGrp->GetInt("MarkerSize", 9L);
+}
+