ui: integrated autocompletion and filtering into SearchView

- QtSearchView was split into QtSearchView and QtSearchBox.
- QtSearchBox contains all Qt elements and can use them purely
- QtSearchView forwards calls from the SearchController to QtSearchBox
- Searching is initiated with MessageSearch to the SearchController
- Autocompletion is initiated with MessageSearchAutocomplete to the SearchController
- The search field is able to create filter queries by only giving autocompletions for the last token in the query
- For named tokens the search field adds their token ids to the query in the form of "A,25" for faster lookup

bug id = #21

src/test/GraphFilterTestSuite.h

@@ -161,7 +161,7 @@ public:
 
 	void test_GraphFilterToken()
 	{
-		GraphFilterToken filter("main");
+		GraphFilterToken filter("main", std::set<Id>());
 
 		TS_ASSERT_EQUALS(
 			printedFilteredTestGraph(&filter),