- remove from third-party
- move USE_SYSTEM_CLI11 to BareosCpmPackages.cmake
- remove set_target_properties IMPORTED_GLOBAL as TRUE by default
  with find/add_librairy
- gtests: remove extra third \n in expected cli help output
  with CLI11 2.4.2 cli --help will output no more extra line

Signed-off-by: Bruno Friedmann <bruno.friedmann@bareos.com>

- remove from third-party
- move `USE_SYSTEM_XXHASH` to BareosCpmPackages
- remove set_target_properties IMPORTED_GLOBAL as TRUE by default
  with find/add_library

Signed-off-by: Bruno Friedmann <bruno.friedmann@bareos.com>

Instead of using CPMLicense.cmake, we now emit a YAML file that contains
a bit of meta-data for the packages that were added via CPM.
This YAML file can then be consumed by pr-tool update-license to
generate a proper LICENSE.txt

Add a new cmake option CPM_ONLY. Setting this to ON will
* add all CPM packages
* stop further configuration

Effectively this will make CPM fetch all packages, using cached packages
when available, and exit. Thus the resulting CMAKE_BINARY_DIR will
contain the CPM packages and the YAML file `cpm-packages.yaml` that
provides a list of the packages along with some meta-information.

The find module for xxHash will now check if building for x86_64,
check if the xxh_x86dispatch.h header is available and set
XXHASH_ENABLE_DISPATCH if both is true.

After carefully re-reviewing xxHash's CMakeLists.txt we can use it.
The offending parts were:
* setting policies
  * these are always set in the CMake versions we require
* overriding CMAKE_BUILD_TYPE
  * mitigated by reordering the includes in our CMakeLists.txt
* overriding BUILD_SHARED_LIBS
  * has no (global) effect

The remaining custom code detects if dispatching is possible and sets
the flag accordingly.

update-license will now fetch the licenses from the CPM packages we
consume.
To achieve this we run `cmake -DCPM_ONLY=ON -DUSE_LOCAL_PACKAGES=OFF`,
consume the resulting cpm-packages.yaml to find the license files and
reformat them into debian copyright format.

On a source tree that doesn't support CPM_ONLY (i.e. Bareos 23 and
older) the old behaviour is retained.

to avoid a duplicate when this license is added using the CPM license
discovery mechanism in the near future, we remove it from the template.

debian 12+ wants to build fully disconnected and all packages we need
are available in the distro.
This patch loosens the software versions CPM requires and adds
dependencies to the Debian control file.

freebsd wants to build fully disconnected and all packages we need
are available in ports.
This patch adds required dependencies to the port's Makefile.

Enable FetchContent and disable CPM_USE_LOCAL_PACKAGES when building
a universal client.
The point of the universal client is to have as few dependencies as
possible. Thus, we should bundle as much as we can, so we don't
accidentally introduce new dependencies.

depending on the version cli11 emits more or less whitespace at the end
of the help output.
By trimming the end of the output, the test now works with different
versions of CLI11.

this adds devtools/install-pip-tools.sh. The script will export the
pip-tools directory of the current commit to ~/.local/lib/bareos-tools,
(re-)create the pipenv environment and put symlinks for the tools into
the first writable directory in your $PATH.