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.

applications/gui2/src/main.cpp

@@ -92,6 +92,18 @@ FTLGui::FTLGui(int argc, char **argv) {
 	if (io_->feed()->listSources().size() == 0) {
 		adder->show();
 	}
+
+	net_->onDisconnect([this](ftl::net::Peer *p) {
+		if (p->status() != ftl::net::Peer::kConnected) {
+			screen_->showError("Connection Failed", std::string("Could not connect to network peer: ") + p->getURI());
+		} else {
+			screen_->showError("Disconnection", std::string("Network peer disconnected: ") + p->getURI());
+		}
+	});
+
+	net_->onError([this](ftl::net::Peer *, const ftl::net::Error &err) {
+
+	});
 }
 
 FTLGui::~FTLGui() {