Merge devices in menu by serial, but allow multiple connection method…

[andrewdavidmackenzie]

Fixes #738

[codecov]

Codecov Report

Attention: Patch coverage is 0.97087% with 102 lines in your changes missing coverage. Please review.

Project coverage is 29%. Comparing base (3dc7fe9) to head (5c1ddca).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/discovery.rs	0%	39 Missing ⚠️
src/views/hardware_menu.rs	0%	26 Missing ⚠️
src/piggui.rs	0%	14 Missing ⚠️
src/piglet.rs	0%	14 Missing ⚠️
src/views/info_dialog.rs	15%	6 Missing ⚠️
src/usb.rs	0%	3 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##           master   #740   +/-   ##
=====================================
+ Coverage      29%    29%   +1%     
=====================================
  Files          45     45           
  Lines        5835   5821   -14     
=====================================
  Hits         1634   1634           
+ Misses       4201   4187   -14     

Flag	Coverage Δ
unittests	29% <1%> (+1%)	⬆️

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