Replace scoped_enum with a better version

[daniel-thom]

Fixes #186

Please don't merge until we agree on companion PRs in the other repos.

[codecov[bot]]

Codecov Report

Merging #192 (dc76173) into master (fd2ce37) will decrease coverage by 2.91%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
- Coverage   75.39%   72.48%   -2.92%     
==========================================
  Files          42       42              
  Lines        2963     2660     -303     
==========================================
- Hits         2234     1928     -306     
- Misses        729      732       +3     

Flag	Coverage Δ
unittests	72.48% <66.66%> (-2.92%)	:arrow_down:

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

Impacted Files	Coverage Δ
src/InfrastructureSystems.jl	66.66% <ø> (ø)
src/internal.jl	70.73% <ø> (-5.87%)	:arrow_down:
src/utils/utils.jl	55.45% <64.28%> (-3.76%)	:arrow_down:
src/time_series_parser.jl	64.78% <100.00%> (-3.97%)	:arrow_down:
src/utils/assert_op.jl	44.44% <0.00%> (-13.89%)	:arrow_down:
src/utils/test.jl	42.30% <0.00%> (-7.70%)	:arrow_down:
src/single_time_series.jl	59.74% <0.00%> (-7.29%)	:arrow_down:
src/time_series_container.jl	53.65% <0.00%> (-6.76%)	:arrow_down:
src/serialization.jl	44.94% <0.00%> (-6.06%)	:arrow_down:
... and 30 more