fixing gcovr usage for -p and -d flags

[LeStarch]

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Change Description

Changes gcov handling:

1. Improves autocoding to allow including via flags: --all-ac, --comp-ac, --port-ac, --type-ac to include each of the types of Ac
2. Removes the special ac directory called {{AUTOCODE}}. Modern gcovr doesn't support it and it was a maintenance nightmare
3. Fixed handling of -d and -p flags

[thomas-bc]

I added a couple of comments but this looks good!

[LeStarch]

Ready for re-review.