Revert "Remove training card window"

This reverts commit 363b50c9c2.

widgets/trainingcard.h

@@ -0,0 +1,37 @@
+#include "application/uilayer.h"
+
+class trainingcard_panel : public ui_panel
+{
+	std::string place;
+	std::string trainee_name;
+	std::string trainee_birthdate;
+	std::string trainee_company;
+	std::string instructor_name;
+	std::string track_segment;
+	std::string remarks;
+
+	std::optional<std::time_t> start_time_wall;
+	float distance = 0.0f;
+
+	std::thread save_thread;
+	std::atomic<int> state;
+
+	void save_thread_func();
+	void clear();
+
+	virtual int StartRecording( void ) {
+		return 1;
+	}
+	virtual int EndRecording( std::string training_identifier ) {
+		return 1;
+	}
+
+  public:
+	trainingcard_panel();
+	~trainingcard_panel();
+
+	void render_contents() override;
+	const std::string *is_recording();
+
+	std::string recording_timestamp;
+};