Refactoring PR #389

[kdmukai]

@overcat, appreciate all your work on this!

As you'll see here, I've refactored your display code to leverage our existing GUI components and constants wherever possible. The TextArea in particular has important additional features: it super-samples small text to render them with much better anti-aliasing which greatly aids in readability.

And then when specifying x,y coords or sizes, as much as possible, it's better to use a relative approach rather than absolute, hard-coded values.

So rather than something like:

y1 = 50
y2 = 125

it's better to do:

y1 = SOME_INITIAL_SPACER
y2 = y1 + element1.height + SOME_COMPONENT_SPACER

I also made a number of adjustments (e.g. font, spacing) to remain consistent with @easyuxd's UI principles.

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I also tweaked the duration timing to be just a little bit longer.

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If you merge this PR into your branch, your PR in the main SeedSigner repo will automatically be updated with these changes.