Changed num_retries from static to an unsigned int

[urmahp]

The num_retries wouldn't be reset within each function, but it will now so the correct number of retries is performed in each function, before throwing an exception.

[codecov]

Codecov Report

Base: 74.09% // Head: 74.55% // Increases project coverage by +0.46% 🎉

Coverage data is based on head (31f2242) compared to base (09adab9).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
+ Coverage   74.09%   74.55%   +0.46%     
==========================================
  Files          91       89       -2     
  Lines        3462     3490      +28     
  Branches      359      367       +8     
==========================================
+ Hits         2565     2602      +37     
+ Misses        680      668      -12     
- Partials      217      220       +3     

Impacted Files	Coverage Δ
src/rtde/rtde_client.cpp	55.97% <100.00%> (+1.67%)	⬆️
tests/test_primary_parser.cpp	81.81% <0.00%> (-8.19%)	⬇️
include/ur_client_library/comm/stream.h	88.88% <0.00%> (-7.12%)	⬇️
include/ur_client_library/rtde/rtde_writer.h	75.00% <0.00%> (-5.00%)	⬇️
tests/test_rtde_parser.cpp	80.45% <0.00%> (-3.45%)	⬇️
include/ur_client_library/queue/atomicops.h	66.66% <0.00%> (-3.08%)	⬇️
tests/test_rtde_client.cpp	80.85% <0.00%> (-0.68%)	⬇️
src/log.cpp	73.80% <0.00%> (-0.61%)	⬇️
src/control/script_command_interface.cpp	11.11% <0.00%> (-0.21%)	⬇️
src/ur/dashboard_client.cpp	61.22% <0.00%> (-0.16%)	⬇️
... and 21 more

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[fmauch]

Looks good to me. Thank you @urmahp