B2CA-1558: Port Ethereum on Flex

[cedelavergne-ledger]

Porting the App on Flex implies few intermediate steps. Here is what this PR includes:

• Adapt tree to Flex, fixing compilation errors
• Declare Flex in the manifest
• Adding Flex dedicated icons (App and Clones)
• Rename glyphs, removing stax prefix, because they are compatible with both Stax and Flex
• Port nbgl_useCase_XXX new API:
  • nbgl_useCaseHomeAndSettings
  • nbgl_useCaseAddressReview
  • nbgl_useCaseReview
  • nbgl_useCaseGenericReview
  • nbgl_useCaseStreamingReview
• Simplify the ragger test functions using scenario_navigator.review_approve and scenario_navigator.review_reject
• Update few BAGL wording to avoid confusion during snapshot comparison (Change Sign to Review on 1st screen)
• Adapt the python client:
  • Adapt the toggle_settings, because Flex has less widgets on each page
  • Add command for new test Perform Privacy Operation
  • Remove useless delay (speculos is no more slow with Stax)
• Adapt the tests:
  • Check against Flex for test_get_address.py
  • Add tests for comand Perform Privacy Operation (can only run on device due to speculos limitation on curve ed25519)
  • Add test for comand Confirm Parameter Selector
• Add Flex snapshots

Note: There is still a remaining point, which is a limitation for now: eip712 is quiete complex, and needs more work to be ported to the new nbgl_useCaseXXX API. Thus, the corresponding ragger tests are skipped for Flex.

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)

[tdejoigny-ledger]

As part of Flex porting it could be good also to update this file in order to prepare the plugins flex porting