Intermediate firmware for T1

[hiviah]

Implementation for issue #4 .

There is also script in script/cibuild_intermediate_fw for CI build.

[tsusanka]

🎉

I will leave the bootloader review for @prusnak but ping me if I should help. I have currently two questions:

1. I guess let's add the CI build script into our CI? See below.
2. Is it a good idea to version it as 1.9.1? Shouldn't we version it as a standalone project maybe? Something to discuss with @prusnak.

legacy intermediary fw build:
  stage: build
  script:
    - cd legacy
    - pipenv run script/cibuild_intermediate_fw
    - cd ..
    - export VERSION=$(./tools/version.sh legacy/intermediate_fw/version.h)
    - mv legacy/firmware/trezor.bin trezor-intermediary-fw-$VERSION-$CI_COMMIT_SHORT_SHA.bin  # is this correct? is the source indeed trezor.bin?
  artifacts:
    name: "$CI_JOB_NAME-$CI_COMMIT_SHORT_SHA"
    paths:
    - trezor-intermediary-fw-*.*.*-$CI_COMMIT_SHORT_SHA.bin
    expire_in: 1 week

[tsusanka]

Ping @prusnak it would be great to move this forward a bit.