Adsbxcot

- Fixes 26: Missing 'adsbxcot' command.
- Bumped 6.0.4 from 6.0.1 because of tagging issues.

- Fixes 25: Missing PyTAK version requirement, should be 6.2.0.

- New for 2024!
- Removed 'light' mode for CoT.
- Documentation Updates.
- Fixes 17. Added ReadTheDocs site.
- Fixes 18: Deprecate ADSBX_URL in favor of FEED_URL akin to adsbcot.
- Fixes 19: Add support for Python 3.10, 3.11, 3.12
- Fixes 15: Add config parameter for 'only show TIS-B': TISB_ONLY
- Fixes 20: Make _aircot_ a sub-element of detail.
- Fixes 21: Use PyTAK's gen_cot_xml()
- Fixes 22: Move setup.py metadata to setup.cfg
- Fixes 23: Python 3.6 tests failing.
- Fixes 24: Pin Github actions to Ubuntu 20.04

- Added XML Declaration header to output CoT XML.
- Bumpted PyTAK dependency to >= 5.4.0
- Documentation updates.

- Added 'light' mode, to reduce size of CoT messages. [DEPRECATED 2024]

- Refactored handle_data.
- Pinned aircot dependency to >= 1.2.0