WIP === Blender exporter plugin

[portaloffreedom]

pybind11 required

Building the plugin is disabled by default. To configure cmake to build the plugin, build and use the plugin, follow these instructions (Linux instructions):

# configure
cmake -B build-blender-exporter -DWICKED_PIC_CODE=ON -DBLENDER_EXPORTER=ON
# build
cmake --build build-blender-exporter

# complete plugin folder (link wicked built library in plugin folder)
cd BlenderExporter/wicked_blender_exporter
ln -s ../../build-blender-exporter/BlenderExporter/pywickedengine.cpython-3*-x86_64-linux-gnu.so

# make plugin visible to blender 4.1 (with a link)
mkdir -p $HOME/.config/blender/4.1/scripts/addons
cd -p $HOME/.config/blender/4.1/scripts/addons
ln -s /${REPLACE_WITH_YOUR_PATH_TO}/WickedEngine/BlenderExporter/wicked_blender_exporter

The enable the plugin inside blender addons

[portaloffreedom]

(rebased to latest master)