[bugfix] Final word calc UI spacing fix; `TextArea` consistency/placement improvements

[kdmukai]

• Fixes rendering on ToolsCalcFinalWordShowFinalWordView
• Updates TextArea to be more internally consistent and easier to work with (with respect to text height and positioning). Now the Screen has full control over whether or not the TextArea includes pixels rendered below the baseline in its height/spacing calculations.
• Light refactor in the Calc Final Word Views to move the actual final words calcs into ToolsCalcFinalWordShowFinalWordView in order to make that View independent (necessary in order to generate screenshots).
• Adds screenshots for ToolsCalcFinalWordShowFinalWordView variations.
• Improves screenshot generator's error reporting to aid in debugging failed screenshots.

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[jdlcdl]

As of commit 53e6205:

Tested the beaf4ae pre-release image and confirmed that text hung below the button, and that this pr fixes that display as is represented in screenshots above.

[newtonick]

ACK and Tested