43 add gps location and time sync support #53
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Trial runs show the camera sends 0x5042 every minute or so to request a geo update. Testing shows the NimBLE stack deadlocks if we try to send from the notification callback handler. Thus, we set a variable and send the geo update via the menu handling loop. Set the GPS coordinates to Montevideo to test signed lat/long handling. (This in-lieu of an actual GPS unit). Hardcode the GPS reference time to Christmas day, 2024 at 12:34:56. Correct the final characteristic write to be an indication, not a notification.
This _seems_ to be more reliable, but needs more testing.
Add a settings menu entry to show real-time GPS information. GPS is active as soon as system is started. Must be in 'Remote Control' shutter menu for GPS data to be properly updated. This is still a work in progress, but looks like the major pieces are working. Battery life is atrocious at this stage. LED will flash slowly to indicate GPS fix is pending. Flash speed will increase when GPS fix is acquired. If GPS updates are not received after 60 seconds, go back to pending.
Add header widget for GPS fix/nofix.
Additionally, redraw the GPS header widget on update.
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Add support for the Grove GPS unit.