Add "republish on reconnect" preference

[growse]

#1178

Adds a preference to allow a user to indicate that a location + extended data should be re-published when MQTT is reconnected after a disconnect.

[codecov]

Codecov Report

Base: 45.98% // Head: 40.13% // Decreases project coverage by -5.84% ⚠️

Coverage data is based on head (2470963) compared to base (7931ce9).
Patch coverage: 53.84% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1273      +/-   ##
============================================
- Coverage     45.98%   40.13%   -5.85%     
+ Complexity     1021      865     -156     
============================================
  Files           173      173              
  Lines          6776     6794      +18     
  Branches        693      694       +1     
============================================
- Hits           3116     2727     -389     
- Misses         3274     3698     +424     
+ Partials        386      369      -17     

Flag	Coverage Δ
uitests	40.13% <53.84%> (-0.92%)	⬇️
unittests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...android/services/MessageProcessorEndpointMqtt.java	25.00% <28.57%> (-2.31%)	⬇️
.../java/org/owntracks/android/support/Preferences.kt	56.61% <58.82%> (-23.75%)	⬇️
...cks/android/model/messages/MessageWithCreatedAt.kt	100.00% <100.00%> (ø)
...g/owntracks/android/services/MessageProcessor.java	46.34% <100.00%> (-2.04%)	⬇️
.../java/org/owntracks/android/model/CommandAction.kt	0.00% <0.00%> (-100.00%)	⬇️
...rg/owntracks/android/model/messages/MessageCard.kt	0.00% <0.00%> (-100.00%)	⬇️
...ntracks/android/model/messages/MessageEncrypted.kt	0.00% <0.00%> (-100.00%)	⬇️
...tracks/android/ui/map/MapLayerBottomSheetDialog.kt	0.00% <0.00%> (-85.00%)	⬇️
...org/owntracks/android/model/messages/MessageCmd.kt	0.00% <0.00%> (-62.50%)	⬇️
...g/owntracks/android/model/messages/MessageClear.kt	0.00% <0.00%> (-60.00%)	⬇️
... and 31 more

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