Gpsdio

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- Support driver and compression options on the commandline and in `ctx.obj` - 71
- Added `[gpsdio.drivers]` entry-point to load external drivers - 70
- Added `--quiet` and `--verbose` flags and stashed values in `ctx.obj` - 65, 67
- Added a `--version` flag - 66, 67
- `gpsdio validate` takes top-level arguments - 62

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- Critical packaging bug fix.

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- External CLI commands can now be registered via a `[gpsdio.gpsdio_plugins]` entry-point - 54
- `gpsdio.open()` can now read from `stdin` or write to `stdout` via '-' - 50
- Deprecated CLI command `gpsdio convert` in favor of `gpsdio etl` - 49
- New CLI commands: cat, env, etl, insp, and load - 49
- Better driver handling internally.

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- Rebranded `gpsd_format` as `gpsdio`.
- Initial development.


Changes
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