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

@@ -224,6 +224,11 @@ Feed::~Feed() {
 	UNIQUE_LOCK(mtx_, lk);
 	//ftl::saveJSON(FTL_LOCAL_CONFIG_ROOT "/feed.json", feed_config);
 
+	handle_receiver_.cancel();
+	handle_record_.cancel();
+	handle_sender_.cancel();
+	record_recv_handle_.cancel();
+
 	receiver_.reset();  // Note: Force destruction first to remove filters this way
 	sender_.reset();
 	recorder_.reset();