Investigate removing prefixes of event names in property grid

[KeyWorksRW]

Description:

Event names like wxEVT_AUINOTEBOOK_PAGE_CLOSE can be quite long, and when displayed in the property grid, the right side of the event name can be cut off. The user can widen the area while wxUiEditor is running, but that setting does not persist.

One possible way to handle this would be to provide a way to remove a specific prefix when the event name is displayed. If we can do this and still have the full event name displayed in the help box, then this would often remove the clipping problem with long event names.