Added support for KeePass field references: https://keepass.info/help/base/fieldrefs.html

See libkeepass/pykeepass#178 for the related implementation in pykeepass.

• Fix custom_properties - long chain are truncated #46
• Add support kdbx key file for attachment extraction #44

• use sys.executable as path to python
• add Bash/Shell environment variables for better CI integration

Password is not mandatory for opening keepass db (only the key file can be used)

Added module for writing attachments to file system

Added fetching attachments

Small fixes

• add ansible galaxy collection

Add pykeepass==4.0.1

• Replace socket data format from json to plain text
• Fix fetching entities contains slashes in path
• Move code into one file (socket opening by the plugin)