NBGL improvements to factorize code

[nroggeman-ledger]

Description

The goal of this PR is to improve layout layer of NBGL to factorize code in Bolos UX.
This shouldn't concern any application.

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)

Breaking changes

Prototype of nbgl_layoutAddLargeCaseText() has changed, but it is not used by any app (on LegderHQ)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.49%. Comparing base (96fbd22) to head (58b0ac0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #812   +/-   ##
=======================================
  Coverage   35.49%   35.49%           
=======================================
  Files          13       13           
  Lines        1606     1606           
=======================================
  Hits          570      570           
  Misses       1036     1036           

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

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