Much documentation. A few deprecations.

[boydm]

Description

Motivation and Context

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature
  but make things better)

Checklist

• Check other PRs and make sure that the changes are not done yet.
• The PR title is no longer than 64 characters.

[codecov]

Codecov Report

Merging #88 into master will decrease coverage by 0.04%.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##           master     #88      +/-   ##
=========================================
- Coverage   91.45%   91.4%   -0.05%     
=========================================
  Files          80      80              
  Lines        1908    1909       +1     
=========================================
  Hits         1745    1745              
- Misses        163     164       +1

Impacted Files	Coverage Δ
lib/scenic/primitive/style/font.ex	100% <ø> (ø)	⬆️
lib/scenic/primitive/path.ex	100% <ø> (ø)	⬆️
lib/scenic/primitive/rectangle.ex	100% <ø> (ø)	⬆️
lib/scenic/primitive/scene_ref.ex	100% <ø> (ø)	⬆️
lib/scenic/primitive/style/font_blur.ex	100% <ø> (ø)	⬆️
lib/scenic/view_port.ex	91.42% <ø> (ø)	⬆️
lib/scenic/primitive/style/scissor.ex	100% <ø> (ø)	⬆️
lib/scenic/primitive/style/font_size.ex	100% <ø> (ø)	⬆️
lib/scenic/primitive/ellipse.ex	100% <ø> (ø)	⬆️
lib/scenic/primitive/style/theme.ex	100% <ø> (ø)	⬆️
... and 24 more

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