Add option to omit source code from when snippet info is saved to file

[delphidabbler]

Similarly to issue #141 it would be useful to have an option where source code is not included in the snippet information when saved to file.

Once implemented for this issue or issue #141 it should be quite straightforward to implement the other issue. Famous last words!

[delphidabbler]

On further consideration I don't think many people would have much use for snippet information without source code, so rejecting.