[TD]Refactor LTNP correction code for Dimensions

- additional geometry types

- add method to handle line like bsplines

- handle deleted ref body feature

- add test for empty savedGeometry

- add switch for matcher/LTNP on/off

src/Mod/TechDraw/App/Preferences.cpp

@@ -527,3 +527,13 @@ int Preferences::sectionLineConvention()
 {
     return getPreferenceGroup("Standards")->GetInt("SectionLineStandard", 1);
 }
+
+
+//! true if the GeometryMatcher should be used in correcting Dimension references
+bool Preferences::useExactMatchOnDims()
+{
+    return getPreferenceGroup("Dimensions")->GetBool("UseMatcher", true);
+}
+
+
+