* Extend copy to clipborad function to support customized mime types
* Remove function default parameter syntax
* Add plainText option
* Use plainText name
* Set "text/plain" data only when it exists
* Docs update
* Docs update
This avoids breaking existing code that expects to be able to import the core macros with just $:/tags/Macro
@pmario - I suggest that future updates use the same approach
Thanks to @ericshulman for reporting the problem
