Developer GUI mode

Work in progress dev GUI module. But also the cudatl library.

applications/gui2/src/modules/dev/developer.cpp

+#include "developer.hpp"
+#include <nanogui/entypo.h>
+#include <nanogui/layout.h>
+#include "../../widgets/popupbutton.hpp"
+#include "../../screen.hpp"
+
+using ftl::gui2::Developer;
+
+void Developer::init() {
+	//screen->addModule<ExtrinsicCalibration>("calib_extrinsic", this, screen, io);
+	//screen->addModule<StereoCalibration>("calib_stereo", this, screen, io);
+
+	// NOTE: If more GUI code is added, consider moving the GUI cude to a new
+	//       file in ../views/
+
+	// Should implement PopupMenu widget which would abstract building steps
+	// and provide common feel&look. (TODO)
+
+	auto button = screen->addButton<ftl::gui2::PopupButton>("", ENTYPO_ICON_TOOLS);
+	button->setChevronIcon(0);
+	button->setTooltip("Developer Tools");
+
+	auto* popup = button->popup();
+	popup->setLayout(new nanogui::BoxLayout
+		(nanogui::Orientation::Vertical, nanogui::Alignment::Fill, 10, 6));
+
+	auto* button_disp = new nanogui::Button(popup, "Disparity Tools");
+	button_disp->setCallback([this, button, button_disp, popup](){
+		button->setPushed(false);
+		button_disp->setPushed(false);
+		button_disp->setFocused(false);
+		auto* disp = screen->getModuleNoExcept<DisparityDev>();
+		//auto* view = new ftl::gui2::IntrinsicCalibrationStart(screen, calib);
+		//screen->setView(view);
+
+		if (!disp) screen->addModule<DisparityDev>("disparity_dev", this, screen, io);
+	});
+
+	/*auto* button_extrinsic = new nanogui::Button(popup, "Extrinsic Calibration");
+	button_extrinsic->setCallback([this, button, button_extrinsic, popup](){
+		button->setPushed(false);
+		button_extrinsic->setPushed(false);
+		button_extrinsic->setFocused(false);
+		auto* calib = screen->getModule<ExtrinsicCalibration>();
+		auto* view = new ftl::gui2::ExtrinsicCalibrationStart(screen, calib);
+		screen->setView(view);
+	});
+
+	auto* button_stereo = new nanogui::Button(popup, "Stereo Calibration");
+	button_stereo->setCallback([this, button, button_extrinsic, popup](){
+		button->setPushed(false);
+		button_extrinsic->setPushed(false);
+		button_extrinsic->setFocused(false);
+		auto* calib = screen->getModule<StereoCalibration>();
+		auto* view = new ftl::gui2::StereoCalibrationStart(screen, calib);
+		screen->setView(view);
+	});*/
+
+	button->setVisible(true);
+}
+
+Developer::~Developer() {
+	// remove button
+}
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