feature/Bottom padding for text in automatic row calculation

[blanchardglen]

Description

This feature adds a Bottom parameter to the prop.Text similar to the Top parameter.

Only used as part of the new AutoRow feature to give some extra spacing to the bottom of the text. This has a dual purpose:

1. Add padding to the bottom of text rows
2. Expand the automatic calculation of the font height especially for descending glyphs

Checklist

check with "x", ONLY IF APPLIED to your change

• All methods associated with structs has func (<first letter of struct> *struct) method() {} name style.
• Wrote unit tests for new/changed features.
• Followed the unit test when,should naming pattern.
• All mocks created with m := mocks.NewConstructor(t).
• All mocks using m.EXPECT().MethodName() method to mock methods.
• Updated docs/doc.go and docs/*
• Updated example_test.go.
• Updated README.md
• New public methods/structs/interfaces has comments upside them explaining they responsibilities
• Executed make dod with none issues pointed out by golangci-lint

[Fernando-hub527]

Very good!!

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 87.03%. Comparing base (884d352) to head (1da080f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/props/text.go	0.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #478      +/-   ##
==========================================
- Coverage   87.18%   87.03%   -0.15%     
==========================================
  Files          61       61              
  Lines        2315     2319       +4     
==========================================
  Hits         2018     2018              
- Misses        265      268       +3     
- Partials       32       33       +1     

Flag	Coverage Δ
unittests	87.03% <20.00%> (-0.15%)	⬇️

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