Reinstate ability to submit new snippets for inclusion in code-snippets collection

[delphidabbler]

Reinstating this feature would entail many more manual steps than the earlier that was removed when the CodeSnip web services closed down.

Specifically:

1. We use a special version of the existing snippet export that generates separate files for each snippet. Such files would be in the required .ini format ready for immediate pasting into the required category.
2. The user opens an issue on the delphidabbler/code-snippets repo to suggest the new snippet.
3. The user attaches the files(s) containing the snippets(s).
4. The user provides either a unit test, a demo or illustrates expected output.
5. Once approved and edited the snippet is imported into a suitable category of the database.