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/lib/data/query/QueryNode.cpp

@@ -29,7 +29,7 @@ void QueryNode::print(std::ostream& ostream, int n) const
 		ostream << ')';
 	}
 
-	if (!m_isComplete || !isComplete())
+	if (!isComplete())
 	{
 		ostream << " INVALID";
 	}
@@ -47,6 +47,11 @@ void QueryNode::setIsGroup(bool isGroup)
 	m_isGroup = isGroup;
 }
 
+bool QueryNode::isComplete() const
+{
+	return m_isComplete && derivedIsComplete();
+}
+
 void QueryNode::setIsComplete(bool isComplete)
 {
 	m_isComplete = isComplete;