Automatic File Naming: add an Available Option {preset}

[wgf_bean]

Feature request:
For Automatic File Naming, add an Available Option {preset} to insert the name of the preset used.

Rationale: I manually put -{preset} at the end of all my filenames to help remind me what I used for that encode. I never modify a preset, but rather just make a new one, e.g. br3, br4, etc. This way I can always go back to see how it was configured.