[WIP] Adding more BTLE PDUs

[Matheus-Garbelini]

Hello @gpotter2 and @guedou I'm doing this preliminary PR to add more PDUs for BTLE layer and fix some problems I've found for CRC and BTLE_CONNECT_REQ. Keep in mind that this is a way preliminary PR just to sync what changes needs to be done, that's why I didn't even run flake8 and the tests will probably fail as of now.
Here's the summary of new additions, fixes and observations for this PR:

• Added most data PDUs up to BLE 4.2;
• Fixed connection request endianness. AA and crc_init should be little endian;
• Fixed the CtrlPDU layer For some reason it was the same as LL_VERSION_IND layer;
• Added more BTLE_Versions
• LL_FEATURE_RSP is not ready, somewhat I had to brak the bitfield in 16 bits as it was no working well with an odd bit field number;
• The CRC only corresponds to wireshark, if it's in little endian. The bits reversed is fine though.
• The Data channel PDUs name was bases on the BLE standard, but let me know if you'd prefer different and simpler names.

[gpotter2]

This seems to be a duplicate the default func.

[Matheus-Garbelini]

Yes, gonna change this by using dissection_done as proposed by @guedou

[gpotter2]

any updates ?

[Matheus-Garbelini]

@gpotter2 I still haven't updated the code to use dissection_done as @guedou mentioned.