Created New automation functions, file to base 64 and JSON tools

[Toocky]

The following changes are implemented

1. New attachment lookup to return Base64 of file and meta i.e. filename, Mime, Extension
2. Parse String into JSON object
3. Stringify JSON Object - With ability to insert variables into object prior to Stringification.
4. JSON templater with insertion of variables

#2310

Changes in the user interface:

Checklist when submitting a final (!draft) PR

• Commits are tidied up, squashed if needed and follow guidelines in CONTRIBUTING.md
• Code builds
• All existing tests pass
• All new critical code is covered by tests
• PR is linked to the relevant issue(s)
• Rebased with the target branch