bump to v0.6.10

  - update submodule cmake-mods
  - security patches

bump v0.6.9

- update cmake-mods submodule

bump to v0.6.8

  - update submodule cmake-mods
    - fix `versions-extract.py`, make it work for new style `.version.cmake` template

bump to v0.6.7

  - update submodule cmake-mods

bump to v0.6.6

- uses new workflow
- uses new dependabot
- uses new `cmake-mods` common module
- removed old cmake files

rebump to v0.6.5

bump to v0.6.3

- v0.6.3
  - add a simple-app demo app
  - added `app::subtree(prefix)` to get the exact tree node by its dotted path key.
  - make `sub_cmd::get()` and `arg::get()` const
  - doc `bas::_long, _short, _aliases`
  - doc the `app::store()`
  - improved gh action scripts;

bump to v0.6.1

- v0.6.1
  - improved cmake/config-base.h.in;
  - improved gh action scripts;
  - c++20 ready

bump to v0.6.0

### CHANGELOG:

  - improved load-cmdr-cxx.cmake for cmdr-cxx users;
  - updated gh action scripts;
  - fix windows build again;
  - upgraded cmake/ scripts;
    - downward compatible with python 3.8-;
  - upgraded to catch2 3.7.1+;
  - improved compiler detectors and `-#`/`-V` outputs;
  - improved typo/lint pieces;
  - improved macro defs: fix _countof(); added offsetof(); ...
  - cleanup