* Remove no longer required base package
* Do not include Python module anymore; it is not built by default by
the upsteam build script anymore (only if CMake variable SKBUILD is set)
and thus supposedly designed to be distributed in a separate package; this
makes also sense at it avoids rebuilding the C library on every minor Python
release
* Rebuild subtitlecomposer; however, at this point this means its speech
plugin will not be available anymore as even the detection of the library
does not work:
```
-- Could NOT find PocketSphinx (missing: POCKETSPHINX_INCLUDE_DIR) (found suitable version "5.0.0", minimum required is "5")
-- Have NOT Found PocketSphinx - Speech plugin will not be built
```
* Parse `pkgname` from `PKGBUILD` via sourcing to cope with variables
* Allow overriding the container name to be able to re-use an existing
container
* Be verbose when installing packages during the image creation
The current approach was not actually working as the container was not
start with in interactive bash shell (or any kind of process that would
just keep it running once started).
In case this is set to 'Ninja' in user environment, build breaks calling
'make' directly. Instead use the cmake build command which takes
the selected generator into account
* Test with `podman` and add according instructions
* Allow use of a custom `pacman.config`/`makepkg.config` by mounting them
into a special directory within the container
* Simplify provides/conflicts/replaces
* Remove reference to mingw-w64-freetype which should be long gone
* Remove "replaces"; in some use cases one might rather stick with the
bootstrap version
* Explicitly enable/disable harfbuzz so the bootstrap version won't
accidentally depend on it if it is installed in the build environment
