cli: add model search path #20
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Adds 2 CMake options:
VISP_INSTALL_MODELS- (default: off) enable to download and install a set of default modelsVISP_MODEL_INSTALL_DIR- (default: share/visioncpp) set the path to install models, usually relative to install prefixWhen enabled,
VISP_MODEL_INSTALL_DIRis also hardcoded intovision-clias an additional search path for models. The search paths are prioritized as follows:modelssubfolder of current working dir$VISION_MODEL_DIRenvironment variable$XDG_DATA_HOME/visioncpp$HOME/.local/share/visioncppVISP_MODEL_INSTALL_DIR