Nicer default printing

[kahaaga]

Fixes #286.

Introduces:

• core/pretty_printing.jl. Contains generic pretty-printing code for relevant types in our package. Defines
  • The vector our_abstract_types, which lists the types for which we want to pretty-print.
  • Functions that can be overridden if special printing for individual types are needed. For example:
    • hidefields can be overridden to not display certain internal fields. Used e.g. for RelativeMeanEncoding to hide the binencoder field.
    • special_typeparameter_info can be overridden to display certain extra type information. By default, all type annotations are stripped away while pretty-printing. However, for OrdinalPatterns we want it to be printed as OrdinalPatterns{3}(...) and not OrdinalPatterns(...). Overriding this method takes care of that.

Formatting

• Non-ComplexityMeasures types are printed with default typeface, font and color.
• ComplexityMeasures type names are printed with custom colors and font weight. Parentheses are color-matched to the names, so it is easier to see which fields belong to what type. The type_printcolor and type_field_printcolor functions determine which color is used for printing (default to the color :default).
• In #286 we discussed that we could show the type for some fields and the actual values for other fields. Here, I opted for always showing the values. Pretty printing is always done in a nested manner. However, we can customize this for particular types if needed.I think it looks pretty decent as is, so that can be dealt with in separate issues if needed.

Approach

To ensure pretty printing is defined for all our types, we loop over our_abstract_types, and use @eval to override two Base methods:

• For stand-alone printing, we override Base.show(io::IO, ::MIME"text/plain", x). The behavior is
  • If the type has only one field to be displayed, it is displayed in compact (one-line) form (screenshot example 1)
  • If the type has two or more fields, then it is displayed over multiple lines (screenshot example 2)
• For compact printing, e.g. inside vectors, we override Base.show(io::IO, x). This will always display the one-line version (screenshot example 3)

[codecov[bot]]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (c82bc30) 89.29% compared to head (457cb36) 88.68%.

:exclamation: Current head 457cb36 differs from pull request most recent head 3467647. Consider uploading reports for the commit 3467647 to get more accurate results

Files	Patch %	Lines
src/core/pretty_printing.jl	70.88%	23 Missing :warning:
src/encoding_implementations/ordinal_pattern.jl	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #381 +/- ## ========================================== - Coverage 89.29% 88.68% -0.62% ========================================== Files 79 80 +1 Lines 2271 2359 +88 ========================================== + Hits 2028 2092 +64 - Misses 243 267 +24 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.