Corrected alignment adjustment logic.

[awhitford]

One of my recent changes replaced the logic in RotateAnimatedTextKit to handle the alignment property. The new logic was revised to use the + operator, which assumed that alignment was an Alignment. However, it is actually an AlignmentGeometry, so the code was reverted to use the add method, which can accommodate Alignment or AlignmentDirectional. Ultimately, an Alignment is required by the AlignmentTween, so the add result needs to be resolved, which requires the textDirection. The final code is type safe.

• Added textDirection to RotateAnimatedTextKit which was necessary to accommodate an AlignmentGeometry override.
• Replaced Alignment constants with built-in constants making it easier to read and maintain.
• Added workaround for gesture detection taps, so was able to validate the onTap callback for RotateAnimatedTextKit and boost code coverage.
• Corrected an incorrect comment which erroneously stated the wrong default value.

[codecov]

Codecov Report

Merging #138 into master will increase coverage by 1.73%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #138      +/-   ##
==========================================
+ Coverage   80.26%   81.99%   +1.73%     
==========================================
  Files           8        8              
  Lines         760      761       +1     
==========================================
+ Hits          610      624      +14     
+ Misses        150      137      -13     

Impacted Files	Coverage Δ
lib/src/rotate.dart	81.00% <100.00%> (+13.32%)	⬆️

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[aagarwal1012]

lgtm

[awhitford]

Related to #128, code coverage is now 82%. 🎉