FWEO-1192 - New UI for Stax

[nroggeman-ledger]

Description

The goal of this PR is to adapt NBGL to new Stax design, aligned on Flex one. According to https://ledgerhq.atlassian.net/browse/FWEO-1192

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

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 60.19%. Comparing base (8cfa715) to head (45f60a4).

Files	Patch %	Lines
lib_nbgl/src/nbgl_obj.c	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #696      +/-   ##
==========================================
- Coverage   60.54%   60.19%   -0.35%     
==========================================
  Files          12       12              
  Lines        1726     1726              
==========================================
- Hits         1045     1039       -6     
- Misses        681      687       +6     

Flag	Coverage Δ
unittests	60.19% <0.00%> (-0.35%)	⬇️

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