Dewi-commands

- use type annotations w/o typing module, requires python 3.10+
- filesync kubernetes app: add experimental parallel sync support
- pin dependencies; selenium requires urllib3 < 2
- add shell (bash) command & plugin (python3 -m dewi_commands.commands.shell)

- packt: use log_*() methods instead of internal logger
(_logger since dewi-core 5.2.0)

- add 'find' command to emulate (GNU) find on Windows
- fix deprecation warnings (Python 3.8)
- depends on Python 3.8+ (or at least not tested with earlier verisons)
- add 'fetch-covid-hu' to fetch koronavirus.gov.hu
- add 'hash' and 'stocks' commands
- 'license change': support Apache2, LGPL v3 and GPL v3 licenses
- add 'dewi_commands.commands.DeprecatedCommandsPlugin' (packt
and ssh_on_ubuntu_on_windows)
- add all commands to the command plugin except the deprecated commands
(http, primes, sysinfo)

- setup.py: add missing dependencies

- add 'sysinfo' command to examine current system and create report
- http command: change server name to DEWI
- add worktime command to track work time from a text file,
and import into sqlite (incomplete sqlite support)
- add jsonformatter command
- update filesync's --entry help string to contain the format of an entry
- add dice command to roll dice specified in RPG style
- add __main__ to each command's module using SingleCommandApplication

- !!! DEWI goes into multiple repositories and packages
- use only 'protected' members with single leading underscore ('_')a
- commands: argparse.Namespace object's 'protected', custom
members end with '_' instead of leading '_',
- add sortphotos command to sort a bunch of photos into directories
named based on shoot date
- add http command to stream /dev/urandom, mainly for testing purposes
- add primes command to calculate the first N primes
- add packt command to download books and codes from packtpub
note, that it's broken as of now as the web UI is modified already
- keep commands only
- start using semantic versioning