Add single level crowdsim demo for clinic and office

[tianenchong]

This adds office and airport_terminal demo with crowd simulation, i.e. you get to see people walking in the office doing sorts of things while tinyrobot fleets are running around.

Added building_crowdsim build task for just office and airport_terminal world in CMakeLists.txt in rmf_demo_maps. Added MaleVisitorPhone Model to rmf_demo_assets. Added launch file named office_crowd.launch.xml and airport_terminal_crowd.launch.xml alongside with other demo launch files Modified office.building.yaml and airport_terminal.building.yaml to Fred's version to include parameter key: human_goal_set_name Modified airport_terminal.building.yaml to include crowd_sim and remove _placeholder to match agents_name under crowd_sim

[luca-della-vedova]

We are trying to avoid committing binaries to the repo since they make its size increase quite a lot (we had a few assets in the past and because git clones the whole history now the repo is quite large). Would it be possible to not include the model and have it downloaded by the tools from Fuel (i.e. pit_crew) at map building time?

[tianenchong]

I think it is possible. I see if I can make changes to CMakeLists.txt in rmf_demo_assets. Got it to work. See commit 350373a

[luca-della-vedova]

I'm not a particularly big fan of this approach since it requires manual edits to the CMakeLists for every single model. We have a tool for automatically downloading the models needed in simulation, pit_crew, which might be a better fit for the purpose (and wouldn't require changing the CMakeLists for every model that we add).

Iirc the model_downloader is also integrated with the map building process so it is ran at building time.

[tianenchong]

superseded by feature/add multilevel crowdsim pr