specify the functionality of clear on all objects

[jgostick]

The workspace, simulation (or project), and all base objects need to behave in a certain way upon calling clear.

Each one should be discussed and implemented properly, and consistently.

[jgostick]

I think clear on the Simulation is ok as it...it should just remove all objects from the simulation and let the user start again. Because there is no object handles being stored anywhere else this should be a straight-forward operation.

[jgostick]

1. Clear on workspace clears everything (note this will NOT remove the reference to objects that may be lingering on the command line)
2. Clear on simulation clears everything (same issue as above)
3. Clear on a base object should probably do something different depending on what type of object it is. Things to consider are:

• Should it clear only calculated values or also associated models?
• Should it optionally clear labels, properties, models, etc? Only empty labels?
• How thoroughly should it remove it's own references from other objects (i.e. it's labels)