FIX: Update the menu properly in the dynamic function editor
When creating or deleting functions in the dynamic function editor, update the list of available functions in the menu properly. Previously, updates were failing, so you had to close and re-open the editor window to refresh the list of available functions.
ENH: Accept CRLF line breaks in dynamic function export files
Now that dynamic function export files, i.e. ".slj" files, have line breaks in them, it's possible for them to be transmitted and copied in such a way that their LF line terminators get turned into CRLF, e.g., if someone views a .slj file in a browser and then copies and pastes it into a text file on Windows. There's no reason why we can't support this, so let's do it.
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