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/graph/Graph.cpp

@@ -75,16 +75,6 @@ size_t Graph::getEdgeCount() const
 	return m_edges.size();
 }
 
-const std::map<Id, std::shared_ptr<Node>>& Graph::getNodes() const
-{
-	return m_nodes;
-}
-
-const std::map<Id, std::shared_ptr<Edge>>& Graph::getEdges() const
-{
-	return m_edges;
-}
-
 Node* Graph::getNodeById(Id id) const
 {
 	std::map<Id, std::shared_ptr<Node>>::const_iterator it = m_nodes.find(id);
@@ -105,14 +95,14 @@ Edge* Graph::getEdgeById(Id id) const
 	return nullptr;
 }
 
-Token* Graph::getTokenById(Id id) const
+const std::map<Id, std::shared_ptr<Node>>& Graph::getNodes() const
 {
-	Token* token = getNodeById(id);
-	if (!token)
-	{
-		token = getEdgeById(id);
-	}
-	return token;
+	return m_nodes;
+}
+
+const std::map<Id, std::shared_ptr<Edge>>& Graph::getEdges() const
+{
+	return m_edges;
 }
 
 void Graph::removeNode(Node* node)