add continuum tracer

[wkerzendorf]

this adds back the continuum tracer

[codecov]

Codecov Report

Merging #1914 (ed9087f) into master (69be60c) will decrease coverage by 2.15%.
The diff coverage is n/a.

❗ Current head ed9087f differs from pull request most recent head bca04be. Consider uploading reports for the commit bca04be to get more accurate results

@@            Coverage Diff             @@
##           master    #1914      +/-   ##
==========================================
- Coverage   61.19%   59.04%   -2.16%     
==========================================
  Files          69       70       +1     
  Lines        7335     7767     +432     
==========================================
+ Hits         4489     4586      +97     
- Misses       2846     3181     +335     

Impacted Files	Coverage Δ
tardis/tardis/io/logger/logger.py	72.13% <0.00%> (-21.32%)	⬇️
.../tardis/montecarlo/montecarlo_numba/interaction.py	19.04% <0.00%> (-10.69%)	⬇️
...s/tardis/montecarlo/montecarlo_numba/estimators.py	34.48% <0.00%> (-9.27%)	⬇️
tardis/tardis/plasma/properties/atomic.py	53.12% <0.00%> (-8.87%)	⬇️
...rdis/plasma/properties/transition_probabilities.py	24.03% <0.00%> (-7.55%)	⬇️
.../montecarlo/montecarlo_numba/single_packet_loop.py	28.30% <0.00%> (-2.95%)	⬇️
tardis/tardis/io/logger/colored_logger.py	78.94% <0.00%> (-2.64%)	⬇️
...is/tardis/plasma/properties/continuum_processes.py	35.51% <0.00%> (-1.49%)	⬇️
...dis/montecarlo/montecarlo_numba/numba_interface.py	36.53% <0.00%> (-0.39%)	⬇️
tardis/tardis/montecarlo/montecarlo_numba/base.py	32.45% <0.00%> (-0.29%)	⬇️
... and 15 more

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