Update to v08 and start support for dependencies

Correct handling of offset in fetch & install

Refactor parser for more efficient code utilisation

Fix parameter setting for offsets

Also remove unused "choice" extension.
Reduces size by 12

More verbose, but 6 bytes smaller.

All CBOR integers are handled in 64-bit in this library. Because of this, they must be down-cast before use. Some unnecessary 64-bit integer handling was left over. Removing this saves 64 bytes, bringing the parser to 1976 bytes

Add support for hss-lms keys

This is a large refactor that makes the code flow much simpler. The parser still needs better debugging infrastructure.

* Unimplemented variables are no longer used
* Tags are now handled
* bstr wrappers are now handled implicitly where necessary
* Added a new k/v pair handler that processes a key with a type in one shot.
* Added distinct handling for arrays (a sequence of identical types) and lists (a sequence of different types)
* Integrated COSE signature handling
* Added a const array initializer helper macro so that parser element counts are calculated at compile-time.
* Added an image verification handler that consumes SUIT_Digests and handles the algorithm correctly
* Verify manifest against authenticated hash before processing

Simplify pubkey type choices

This commit adds support for hss-lms via the pyhsslms package. 

keygen, pubkey, and sign have all been updated to support the new key type.

This commit also adds some additional debug infrastructure to make parser debugging easier.

Also remove extra prints

Also remove shebang from files that should not be executed directly

Use OrderedDict to ensure that SUIT components are correctly ordered.

Fixes #24

Fix COSE compatibility issue.

Encodes signature value as a byte stream instead of a bstr type.
Fixes #13

Add support for offsets to manifest generator. There are several known issues with multiple component support:

1. The component order is ignored.
2. Digests other than the digest of the installed component may not be inserted.