Alternative implementation of world clock (#216)

* Implementation of alternative world clock.

* Fixed two minor bugs
- Only start in settings mode on first activation
- Fixed typo in time zone names

---------

Co-authored-by: joeycastillo <joeycastillo@utexas.edu>

movement/watch_faces/clock/world_clock2_face.h

@@ -0,0 +1,63 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2023 Konrad Rieck
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef WORLD_CLOCK2_FACE_H_
+#define WORLD_CLOCK2_FACE_H_
+
+/* Number of zones. See movement_timezone_offsets. */
+#define NUM_TIME_ZONES  41
+
+#include "movement.h"
+
+typedef enum {
+    WORLD_CLOCK2_MODE_DISPLAY,
+    WORLD_CLOCK2_MODE_SETTINGS
+} world_clock2_mode_t;
+
+typedef struct {
+    bool selected;
+} world_clock2_zone_t;
+
+typedef struct {
+    world_clock2_zone_t zones[NUM_TIME_ZONES];
+    world_clock2_mode_t current_mode;
+    uint8_t current_zone;
+    uint32_t previous_date_time;
+} world_clock2_state_t;
+
+void world_clock2_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void **context_ptr);
+void world_clock2_face_activate(movement_settings_t *settings, void *context);
+bool world_clock2_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void world_clock2_face_resign(movement_settings_t *settings, void *context);
+
+#define world_clock2_face ((const watch_face_t){ \
+    world_clock2_face_setup, \
+    world_clock2_face_activate, \
+    world_clock2_face_loop, \
+    world_clock2_face_resign, \
+    NULL, \
+})
+
+#endif /* WORLD_CLOCK2_FACE_H_ */