movement: make stopwatch work off-screen + in low energy mode

movement/watch_faces/complication/stopwatch_face.h

@@ -1,3 +1,28 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Wesley Ellis
+ * 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 STOPWATCH_FACE_H_
 #define STOPWATCH_FACE_H_
 
@@ -5,9 +30,8 @@
 
 typedef struct {
     bool running;
-    uint8_t seconds;
-    uint8_t minutes;
-    uint8_t hours;
+    watch_date_time start_time; // while running, show the difference between this time and now
+    uint32_t seconds_counted;   // set this value when paused, and show that instead.
 } stopwatch_state_t;
 
 void stopwatch_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);