Refactor so that plugins can encrypt/decrypt settings.txt

[mmccann-umph]

Would a pull request be accepted that refactors the code such that DataSettingsManager is injected rather than hardcoded.

Doing this would allow the creation of a plugin that encrypts/decrypts settings.txt, enhancing security by no longer storing an unencrypted connection string with username and password on the file system in plain text.

Thank you!

[AndreiMaz]

@mmccann-umph sure. please contribute.

[mmccann-umph]

Will do, thanks!

[a-patel]

suggest you (@mmccann-umph and @AndreiMaz) to use json (settings.json) file instead of text file.

[AndreiMaz]

@a-patel thanks! we've also thought about it - #2597

[AndreiMaz]

After some discussion decided not to implement it out of the box. IT can cause issues when a new data protecion keys are generated, etc