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/calibration/calibration.cpp

@@ -238,6 +238,7 @@ void Calibration::init() {
 
 	auto button = screen->addButton<ftl::gui2::PopupButton>("", ENTYPO_ICON_CAMERA);
 	button->setChevronIcon(0);
+	button->setTooltip("Calibrate Cameras");
 
 	auto* popup = button->popup();
 	popup->setLayout(new nanogui::BoxLayout