minor
[spatial_rels] Removed demo code from the package.
Removed VISIBILITY_COSTMAP. It's in CRAM_EXPERIMENTAL now
Removed TRIANGULATE_POINT_CLOUD, it's in CRAM_EXPERIMENTAL now.
Removed ROBOT_MASK, it's in CRAM_EXPERIMENTAL now.
Removed BULLET_REASONING_DEMO, it's in CRAM_DEMO now.