Trigger task via widget or other external app intent

[PylotLight]

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If this is your first feature request, read our contribution guidelines.

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Pre-Submission checklist

• There is no existing issue that already asks for this feature.
  
• The feature already exists in rclone (on your PC or in Termux)
• I am prepared to help make this feature

What version of Round Sync are you using (About -> App version)?

2.5.6

What problem are you trying to solve?

Be able to call the sync via phone home widget automatically or some other automated system.
As Interval and schedule aren't what I'm looking for, need an on demand task runner.

What should Round Sync be able to do differently to help with this problem?

Add a widget, or intent that other apps can call to trigger a task.

[nvllz]

This could be also binded to app shortcuts.