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/modules/camera.cpp

@@ -39,7 +39,7 @@ void Camera::update(double delta) {
 
 		auto *mod = screen->getModule<ftl::gui2::Statistics>();
 		mod->getJSON(StatisticsPanel::PERFORMANCE_INFO)["FPS"] = n/diff;
-		mod->getJSON(StatisticsPanel::PERFORMANCE_INFO)["Latency"] = l;
+		mod->getJSON(StatisticsPanel::PERFORMANCE_INFO)["Latency"] = std::to_string(int(l))+std::string("ms");
 		if (live_) mod->getJSON(StatisticsPanel::MEDIA_STATUS)["LIVE"] = nlohmann::json{{"icon", ENTYPO_ICON_VIDEO_CAMERA},{"value", true},{"colour","#0000FF"},{"size",28}};
 
 		auto ptr = std::atomic_load(&latest_);