Trim down all FreeRTOS branches

[podhrmic]

We currently have 3 FreeRTOS branches in this repo, which is a bit too much.

My suggestion is:

• remove FreeRTOS-mirror -> it is replaced by FreeRTOS
• maybe even remove FreeRTOS-10.1? It was used for FETT, because it has a crappier network stack. But I am not sure if there is still value in keeping it around.

[rtadros125]

I think we can divide this to:

• [x] Remove FreeRTOS-10.0.1:
  • [x] Change the documentation to make sure we're clear that to get the FETT BugBounty builds, you'd need to checkout an older version (and which version?).
  • [x] Remove the submodule and all the references to it (like removing it from setupEnv, and change all calls to the function).
  • [x] Test the mode = test and evaluateSecurityModes with all combinations to make sure they work with FreeRTOS not 10.0.1
  • [x] Import all modifications in FreeRTOS-10.0.1 that are related to LMCO exception handlers
  • [x] Did we miss any other modifications?
• [x] Remove FreeRTOS-mirror:
  • [x] Remove the submodule and all the references to it (like removing it from setupEnv, and change all calls to the function).
  • [x] Test all affected modes (I think it's netboot?), then trying to netboot everything else and make sure they work.

[podhrmic]

Change the documentation to make sure we're clear that to get the FETT BugBounty builds, you'd need to checkout an older version (and which version?).

The changes between 10.1 and the "classic" are pretty minimal - is there a value in building BugBounty with the newer (less buggy) FreeRTOS?

[rtadros125]

The changes between 10.1 and the "classic" are pretty minimal - is there a value in building BugBounty with the newer (less buggy) FreeRTOS?

The only value is to have the mode=test working because I don't see the value in removing modes from the tool; right?