Split out nodatime, and systemtextjson from the core package, so they…

[david-driscoll]

… can be used independently.

[codecov]

Codecov Report

Merging #273 into master will increase coverage by 1.77%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #273      +/-   ##
==========================================
+ Coverage   90.16%   91.93%   +1.77%     
==========================================
  Files          23       23              
  Lines         671      583      -88     
  Branches      110       90      -20     
==========================================
- Hits          605      536      -69     
+ Misses         66       47      -19     

Impacted Files	Coverage Δ
src/Conventions.AutoMapper/AutoMapperOptions.cs	100.00% <ø> (ø)
...ftJson/SystemTextJsonAndNewtonsoftJsonConverter.cs	100.00% <ø> (ø)
...utoMapper.NodaTime/Converters/DurationConverter.cs	100.00% <ø> (ø)
...AutoMapper.NodaTime/Converters/InstantConverter.cs	100.00% <ø> (ø)
...toMapper.NodaTime/Converters/LocalDateConverter.cs	100.00% <ø> (ø)
...pper.NodaTime/Converters/LocalDateTimeConverter.cs	100.00% <ø> (ø)
...toMapper.NodaTime/Converters/LocalTimeConverter.cs	100.00% <ø> (ø)
....AutoMapper.NodaTime/Converters/OffsetConverter.cs	100.00% <ø> (ø)
...per.NodaTime/Converters/OffsetDateTimeConverter.cs	100.00% <ø> (ø)
....AutoMapper.NodaTime/Converters/PeriodConverter.cs	71.42% <ø> (ø)
... and 7 more

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