URIs expect model names without spaces

[osrf-migration]

Original report (archived issue) by Louise Poubel (Bitbucket: chapulina, GitHub: chapulina).

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Load a world with models that have spaces in their names and get warnings like these:

[Wrn] [URI.cc:321] Unable to parse URI [data://world/default/model/Gas Station?p=vector3d/world_linear_velocity]. Ignoring.
[Wrn] [URI.cc:321] Unable to parse URI [data://world/default/model/House 1/link/link?p=pose3d/world_pose]. Ignoring.
[Wrn] [URI.cc:321] Unable to parse URI [data://world/default/model/Lamp Post/link/link?p=vector3d/world_angular_acceleration]. Ignoring.

[chapulina]

That issue is still there, but it doesn't happen at startup anymore. I believe that changed since the IntrospectionManager was refactored.

Now to reproduce the issue, you can open the plotting tool for example.