GenICam integration

Install a GenTL producer, (e.g. see harvesters README).

OpenDrop checks the environment variable GENICAM_GENTL64_PATH (specified by the GenTL standard) for GenTL producers. To verify that a GenTL producer is installed correctly, you can run:

$ echo $GENICAM_GENTL64_PATH
/opt/mvIMPACT_Acquire/lib/x86_64

(todo: Add details.)