Add Export Function to State Effect Similar to That in Sub-Models Dialog

[MCStoff]

Presently, the only way to transfer state effects among models is to do an import from a model/file. This allows for a one to one import that requires multiple iterations when importing to multiple identical models.

The sub-model dialog allows for an export of sub-models to other models. This allows a one to many export. Adding the export function to the state effects would allow a one to many export, thereby avoiding the necessity of multiple iterations. Further, it would create internal consistency in the program.