ui: Added on-screen search feature (issue #79)

* Use menu action "Edit -> Find in View" or Ctrl + D
* UI displayed as search bar at bottom of main window
* Hide search bar with ECS or close button
* Entering a query searches in name of graph nodes and code contents of code view
* Use Enter to iterate through matches, well move match into view in graph and code view
* Checkboxes allow for adding/removing results for certain views
* Create Bookmark shortcut is now CTRL + S

bug id = 79

src/lib_gui/qt/element/QtCodeFileSingle.cpp

@@ -225,6 +225,14 @@ void QtCodeFileSingle::onWindowFocus()
 	m_title->updateTexts();
 }
 
+void QtCodeFileSingle::findScreenMatches(const std::string& query, std::vector<std::pair<QtCodeArea*, Id>>* screenMatches)
+{
+	if (m_area)
+	{
+		m_area->findScreenMatches(query, screenMatches);
+	}
+}
+
 const FilePath& QtCodeFileSingle::getCurrentFilePath() const
 {
 	return m_currentFilePath;