Port resize into a method outside of lily objects

[mrz1988]

Summary

Remove all resize logic out of LilyBlock and LilyString classes, and create a new resize() helper method. The new resize method:

• Is more opinionated on how to match colors
• Uses new, better language (width, height, align)
• Can take any sort of object, instead of requiring a cast first
• Is smart about the type of object it returns
• Is simpler and more obvious in its use cases

Technical Implications

• LilyString no longer has a resize() method.
• LilyBlocks no longer have resize methods, including resize_x and resize_y.
• LilyBlock.normalize() is now replaced by resize(block).
• grow() now returns a LilyString if an iterable of length 1 is added in (instead of a 1-row LilyBlock).

Why?

As the repo grows, it makes sense to keep lily text objects a bit thinner, and have powerful helper methods do most of the heavy lifting. This is advantageous for a few reasons:

• Lily text objects can be thinner, keeping business logic elsewhere
• The API is easier to learn and understand, with only a handful of useful methods
• Internal logic on Lily text objects require less validation of user input, isolating that elsewhere
• It gives us an opportunity to clean up and unify some of the more confusing aspects of the resize parameters/logic

[codecov]

Codecov Report

Merging #51 (0e2b633) into master (7e800e6) will decrease coverage by 0.20%.
The diff coverage is 91.81%.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
- Coverage   88.12%   87.92%   -0.21%     
==========================================
  Files          34       35       +1     
  Lines        1768     1813      +45     
  Branches      281      301      +20     
==========================================
+ Hits         1558     1594      +36     
- Misses        175      183       +8     
- Partials       35       36       +1     

Impacted Files	Coverage Δ
lilies/style/styles.py	100.00% <ø> (ø)
lilies/objects/lilyblock.py	79.88% <76.92%> (-1.71%)	⬇️
lilies/api/resize.py	91.30% <91.30%> (ø)
lilies/__init__.py	81.81% <100.00%> (ø)
lilies/api/__init__.py	100.00% <100.00%> (ø)
lilies/api/columnify.py	96.72% <100.00%> (+0.05%)	⬆️
lilies/api/grow.py	100.00% <100.00%> (ø)
lilies/objects/lilystring.py	81.61% <100.00%> (-0.33%)	⬇️
lilies/style/__init__.py	100.00% <100.00%> (ø)
lilies/compiler/state_manager.py	82.22% <0.00%> (-4.45%)	⬇️
... and 3 more

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