tint: introduce the new tint build system with checksum verification

Three stages of the new tint build system:

 1) generate_core.sh extracts the core part from buildgcc script,
     most importantly the checksum calculation/verification functions.

 2) tintify_core.sh adds the tint-specific footer/header to the core,
     such as the properties of current version including its checksum.

 3) tint.sh - generated and "tintified" core script - builds a tint.

Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Change-Id: Ib71f5b861ecf91949a5af12812258e60873f0498
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50991
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

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