Rework https://github.com/Arm-Examples/SDS-Examples

[ReinhardKeil]

• All examples should be selectable from the same repository.

  • proper .gitignore, drop-in concept using .vscode.d for Alif examples
  • sdsio.yml project with some test images in the repo
  • Reduce Alif examples to: AppKit-E7-USB, DevKit-E8-ETH

• B-U585 examples need to work also in simulation mode (replace SE-320 FVP with Cortex-M33 FVP)

• Only AC6, GCC used for just one example.

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Once this is complete, add File System and RTT example.

[MiloradCvjetkovic]

I think this is done, except the GCC used for just one example.

The https://github.com/Arm-Examples/SDS-Examples/tree/build_gcc branch contains the workflow for building of AppKit-E7_USB and DevKit-E8_ETH examples which, however, do not work on hardware.