ui: Added second line to search autocompletion list showing namespace or filepath

* Show namespace or filepath in second line of search autocompletions
* Add filepaths relative to .coatidb location
* Rescore matches to acknowledge line split
* Fixed SearchMatch type to be drawn always visible at right edge

src/lib/data/PersistentStorage.h

@@ -151,6 +151,7 @@ private:
 
 	SearchIndex m_commandIndex;
 	SearchIndex m_elementIndex;
+	SearchIndex m_fileIndex;
 
 	mutable FullTextSearchIndex m_fullTextSearchIndex;