Ability to keep seized resources after reneging

[Enchufa2]

Closes #200.

[codecov]

Codecov Report

Merging #204 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
+ Coverage   99.79%   99.79%   +<.01%     
==========================================
  Files          47       47              
  Lines        2958     2971      +13     
==========================================
+ Hits         2952     2965      +13     
  Misses          6        6

Impacted Files	Coverage Δ
inst/include/simmer/process/arrival_impl.h	100% <100%> (ø)	⬆️
inst/include/simmer/activity/renege.h	100% <100%> (ø)	⬆️
inst/include/simmer/process/arrival.h	100% <100%> (ø)	⬆️
src/activity.cpp	100% <100%> (ø)	⬆️
inst/include/simmer/process/batched.h	100% <100%> (ø)	⬆️
R/trajectory-activities.R	98.84% <100%> (+0.04%)	⬆️

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