ui: Added custom trail dialog (issue #249)

* open custom trail dialg via button in top of trail controls
* search from symbol to symbol or all referenced/referencing of symbol
* define search depth with slider
* define horizontal/vertical layout
* define node and edge types
* renamed depth graph to trail in graph ui
* added custom trail UI tests

fortune cookie message = A happy surprise is waiting for you.

src/lib/data/storage/sqlite/SqliteIndexStorage.cpp

@@ -758,6 +758,46 @@ StorageNode SqliteIndexStorage::getNodeBySerializedName(const std::wstring& seri
 	return StorageNode();
 }
 
+std::vector<int> SqliteIndexStorage::getAvailableNodeTypes() const
+{
+	CppSQLite3Query q = executeQuery("SELECT DISTINCT type FROM node;");
+
+	std::vector<int> types;
+
+	while (!q.eof())
+	{
+		const int type = q.getIntField(0, -1);
+		if (type != -1)
+		{
+			types.push_back(type);
+		}
+
+		q.nextRow();
+	}
+
+	return types;
+}
+
+std::vector<int> SqliteIndexStorage::getAvailableEdgeTypes() const
+{
+	CppSQLite3Query q = executeQuery("SELECT DISTINCT type FROM edge;");
+
+	std::vector<int> types;
+
+	while (!q.eof())
+	{
+		const int type = q.getIntField(0, -1);
+		if (type != -1)
+		{
+			types.push_back(type);
+		}
+
+		q.nextRow();
+	}
+
+	return types;
+}
+
 StorageFile SqliteIndexStorage::getFileByPath(const std::wstring& filePath) const
 {
 	return doGetFirst<StorageFile>("WHERE file.path == '" + utility::encodeToUtf8(filePath) + "'");