[Feature Request] Autosave as default for OnlyOffice plugin

[tailspin1]

Autosave is the default behavior in other web based office suites (such as Office 365 and Google) saving the file in real time as the user makes edits. The current default for filestash requires actively saving changes. I understand this is a question of "preference" and users could want it either way. As I see it, the "safer" default would be auto save as this minimizes risk of lost work and is consistent with user experience/expectation from other platforms.

Making this change only requires updating line 443 of the plugin file to:
"autosave": true,
Thank you for your consideration of this request.

[mickael-kerjean]

Happy to accept a pull request for this. We would need to have that feature available behind a config flag for the admin console