build a XenSCE instance for GBM demo data from TENx
build_demo()
This can take some time to run, especially if no resources have been cached yet. The data are derived from `https://www.10xgenomics.com/datasets/ffpe-human-brain-cancer-data-with-human-immuno-oncology-profiling-panel-and-custom-add-on-1-standard`.
if (interactive()) {
gbmdemo = build_demo()
gbmdemo
}