Dewi-logparsers

- use type annotations w/o typing module, requires python 3.10+

- fix generic log parser to work with macOS and Linux

- add Python 3.7 to setup.py and fix package dependencies
- start using semantic versioning

- !!! DEWI goes into multiple repositories and packages
- use only 'protected' members with single leading underscore ('_')
- keep only the dewi.logparser package as dewi_logparsers

- MainApplication: --debug implies --log-level debug
default log level: info
- images/filedb: add count() to count entries in photo_file_info table
- images related commands: use exiftool-5.26 as MacPorts updated it
- safe_delete_images: handle Exceptions at unlink(), mainly PermissionErrors
- add further log_*() calls into dewi.rrdtool & realtime_sync

- pretty-print output command list (e.g. 'list-all')
- add dewi.utils.archive, which contains an UnZip class to (partially) unzip
.zip files
- if a command is mistyped or non-existing, print at most 6 similar command
names, or list all of them
- dewi.images.filedb: add rollback() method to FileDatabase
- dewi.core.context: Context got 'commands' and 'command_registry'
properties, and always contains the corresponding 'commands' and
'commandregistry' fields
- introduce dewi.core.logger module, log_debug, log_info, etc. can be used