Resolves #343 GUI and Frame Refactor

Major rewrite of the GUI into a module and view form, also using a new Feed class. The frame and frameset data structures have also been rewritten to support memory pooling and response frames.

components/streams/src/feed.cpp

@@ -949,7 +949,9 @@ uint32_t Feed::add(const ftl::URI &uri) {
 
 			lk.unlock();
 			for (auto i=sources.begin(); i!=sources.end(); ++i) {
-				add(i.key());
+				ftl::URI uri2(i.key());
+				uri2.setAttribute("group", uri.getPathSegment(0));
+				add(uri2);
 			}
 
 			lk.lock();