This optional update makes available znc version 1.7.0 with multiple useful features:

- Implement IRCv3.2 capabilities away-notify, account-notify, extended-join
- Implement IRCv3.2 capabilities echo-message, cap-notify on the "client side"
- Update capability names as they are named in IRCv3.2
- Make ZNC request server-time from server when available (#839)
- Increase accepted line length from 1024 to 2048 to give some space to message tags
- Support separate SSLKeyFile and SSLDHParamFile configuration in addition to existing SSLCertFile
- Add modules: pyeval, stripcontrols
- Add new substitutions to ExpandString: %empty% and %network%
- Add ClearAllBuffers command
- Set HttpOnly and SameSite=strict for session cookies
- Add SNI SSL client support (#1200)
- Add support for CIDR notation in allowed hosts list and in trusted proxy list
- Add network-specific config for cert validation in addition to user-supplied fingerprints
- Add /attach command for symmetry with /detach