NBGL extensions for future UX screens

[nroggeman-ledger]

Description

The goal of this PR is to add some features to NBGL to enable creating (or extending) future Bolos UX screens.
These extensions are:

• Support animation in centered info (instead icon)
• Support dual rouded buttons in footer
• Support an additionnal icon in some header
• Support sub-text in spinner
• Support ability to change validation icon type in PinPad with arrow instead of check

Changes include

• Bugfix (non-breaking change that solves an issue)
• [*] New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.49%. Comparing base (d59b21f) to head (59f9125).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #827   +/-   ##
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  Coverage   35.49%   35.49%           
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  Files          13       13           
  Lines        1606     1606           
=======================================
  Hits          570      570           
  Misses       1036     1036           

Flag	Coverage Δ
unittests	35.49% <ø> (ø)

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