You can rename a model with invalid characters

[jenhicks]

Steps to reproduce

Load wrist model Change name to Wrist Model - Tendon Surgery

Expected result

Error or warning and name doesn't change to something invalid

Actual result

Invalid name shows up in the navigator and error (red stop sign) doesn't occur until later (e.g., when editing a muscle path).

(include screen grabs where appropriate)

Environment and GUI version

OpenSim 4.0-2018-11-06-f854814, Mac