Passhole

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- catch pynput xorg error
- don't unlock all databases when access an entry

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- use background thread for caching databases, removed `--gpgkey` option
- added `--no-cache` option to prevent background thread caching
- added `--fields` option to `add` command for custom fields
- display created/modified time in `show` output
- only open databases as needed, instead of all
- `type` now accepts 'name' option for choosing database to type from

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- auto generate config
- added dockerfiles for testing

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- removed `--no-keyfile`, `--no-cache` options. these are implicitly given by omitting `--keyfile` and `--cache`
- added multi database support
- added configuration file at ~/.config/passhole.ini