Add a SimConnectionManager to manage multiple connections

[charlestytler]

Supports #83

[codecov-commenter]

Codecov Report

Merging #87 (bfba344) into master (20d0ca0) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   92.39%   92.61%   +0.21%     
==========================================
  Files          59       61       +2     
  Lines        2472     2544      +72     
  Branches       39       39              
==========================================
+ Hits         2284     2356      +72     
  Misses        188      188              

Flag	Coverage Δ
Cpp	96.61% <100.00%> (+0.10%)	⬆️
ReactJS	54.35% <ø> (ø)

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

Impacted Files	Coverage Δ
...amdeckContext/ExportMonitors/ImageStateMonitor.cpp	96.77% <ø> (ø)
...reamdeckContext/ExportMonitors/ImageStateMonitor.h	100.00% <ø> (ø)
...eamdeckContext/ExportMonitors/IncrementMonitor.cpp	100.00% <ø> (ø)
...treamdeckContext/ExportMonitors/IncrementMonitor.h	100.00% <ø> (ø)
.../StreamdeckContext/ExportMonitors/TitleMonitor.cpp	100.00% <ø> (ø)
...pp/StreamdeckContext/ExportMonitors/TitleMonitor.h	100.00% <ø> (ø)
.../StreamdeckContext/SendActions/IncrementAction.cpp	95.23% <ø> (ø)
.../StreamdeckContext/SendActions/MomentaryAction.cpp	100.00% <ø> (ø)
...cpp/StreamdeckContext/SendActions/SwitchAction.cpp	100.00% <ø> (ø)
...ackend-cpp/StreamdeckContext/StreamdeckContext.cpp	100.00% <ø> (ø)
... and 12 more

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