Fix missing documentation for many clock faces:

* Move from .c to .h as needed for consistency.
* When missing from both, copy from pull request or wiki.
* When missing entirely, infer functionality from source code.

movement/watch_faces/complication/time_left_face.h

@@ -25,9 +25,9 @@
 #ifndef TIME_LEFT_FACE_H_
 #define TIME_LEFT_FACE_H_
 
-#include "movement.h"
-
 /*
+ * TIME LEFT face
+ *
  * The Time Left Face helps you to visualize how far you have proceeded in a certain
  * time span. Much like the Day One Face, you can set your beginning date. In addition
  * to that, you also set your target or destination date. You can then use the face
@@ -65,6 +65,8 @@
  * 
  */
 
+#include "movement.h"
+
 typedef struct {
     uint8_t current_page;
     uint16_t current_year;