Financeager

Added
- Changelog file and related tooling.

Added
- Rename `fflask` module to `flask`, adjust WSGI/FCGI scripts accordingly.
Changed
- The upstream `financeager` dependency is required as lower than v1.1.0.
Deprecated
- Python 3.6 support will be removed in v1.0.0.

Added
- Support `--recurrent-only` option for `fina list` command.
Changed
- The upstream `financeager` dependency is required as v1.0.0 or higher.

Fixed
- Correctly generate release notes when running Github release action.

Changed
- The upstream `financeager` dependency is required as lower than v0.26.3.0.
- Extend CLI help for `web-version` command.

Added
- Provide `web-version` CLI command to query information about financeager software version installed on server (2).
Changed
- The upstream `financeager` dependency is required as v0.26.2.0 or higher.