Replace regex support with highlight()

[mrz1988]

Summary

Remove old styling by index and regex on LilyString and LilyBlock objects, and implement a new highlight() utility method that does a similar thing.

Technical Details

Support has been removed for the following methods:

• LilyString.style_chars
• LilyString.style_char
• LilyString.style_regex
• LilyBlock.style_regex

Why?

This continues along the theme of #51 to reduce the footprint and responsibility of Lily object classes, and instead provide powerful, intuitive utility functions. Prefer universal tools rather than forcing casts.

[codecov]

Codecov Report

Merging #53 (2897779) into master (4f3218e) will increase coverage by 1.64%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   89.50%   91.15%   +1.64%     
==========================================
  Files          35       36       +1     
  Lines        1811     1820       +9     
  Branches      301      300       -1     
==========================================
+ Hits         1621     1659      +38     
+ Misses        163      134      -29     
  Partials       27       27              

Impacted Files	Coverage Δ
lilies/objects/lilyblock.py	95.20% <ø> (+2.18%)	⬆️
lilies/__init__.py	81.81% <100.00%> (ø)
lilies/api/__init__.py	100.00% <100.00%> (ø)
lilies/api/highlight.py	100.00% <100.00%> (ø)
lilies/objects/lilystring.py	87.57% <100.00%> (+5.96%)	⬆️

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[mrz1988]

WOO FOR OVER 90% CODE COVERAGE NOW 🎉 🎉
CODECOV IS BESIDE ITSELF