logic: show real code of signatures in tooltips

* added new location type
* refactored old recording code
* record signature locations for cxx functions and java methods
* added signature locations to sample project indexer tests
* ignore signature locations in ui
* signatures in tooltip with qualified name of the function/method
* added test for finding signature location of constructor with initializer list

src/lib_gui/qt/element/QtCodeField.cpp

@@ -346,6 +346,11 @@ void QtCodeField::createAnnotations(std::shared_ptr<SourceLocationFile> location
 	locationFile->forEachSourceLocation(
 		[&](const SourceLocation* location)
 		{
+			if (location->getType() == LOCATION_SIGNATURE)
+			{
+				return;
+			}
+
 			if (location->getLocationId() && locationIds.find(location->getLocationId()) != locationIds.end())
 			{
 				return;