Emulator

As per $SUBJECT, add Manual Update menu entry, to fire up update procedure on demand.

Use case

You prefer to have Auto Updates disabled, but once in a blue moon you want to fire a manual update without:

• entering Config
• selecting [Stable|Beta|Dev] in the Auto Updates drop-down menu
• exiting Dolphin
• starting Dolphin
• accept update
• entering Config
• selecting Don't Update in the Auto Updates drop-down menu

The menu options could be:

File
|-- Manual Update
     |-- Stable channel update
     |-- Beta channel update
     |-- Dev channel update

... or something like that.