Enhance error handling

[Enchufa2]

Provide more informative error messages. Before the patch:

library(simmer)

t <- trajectory() %>%
  timeout(function() NULL)

simmer() %>%
  add_generator("dummy", t, at(pi)) %>%
  run()
#> Error in run_(private$sim_obj, until) :
#>  Expecting a single value: [extent=0].

After this patch, the error becomes

#> Error: 'dummy0' at 3.14 in 'Timeout':
#>  Expecting a single value: [extent=0].

which specifies the arrival name, the current simulation time and the activity type in which the error arised.

[codecov]

Codecov Report

Merging #148 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #148   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          52     52           
  Lines        2848   2852    +4     
=====================================
+ Hits         2848   2852    +4

Impacted Files	Coverage Δ
inst/include/simmer/process/datasrc.h	100% <100%> (ø)	⬆️
inst/include/simmer/simulator_impl.h	100% <100%> (ø)	⬆️
inst/include/simmer/activity/branch.h	100% <100%> (ø)	⬆️
inst/include/simmer/process/manager.h	100% <100%> (ø)	⬆️
inst/include/simmer/resource/priority.h	100% <100%> (ø)	⬆️
inst/include/simmer/process/arrival.h	100% <100%> (ø)	⬆️
inst/include/simmer/activity/utils/resgetter.h	100% <100%> (ø)	⬆️
inst/include/simmer/process/generator.h	100% <100%> (ø)	⬆️
inst/include/simmer/activity/arrival.h	100% <100%> (ø)	⬆️
inst/include/simmer/activity/timeout.h	100% <100%> (ø)	⬆️

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