Implement global setting for run on save

[belav]

closes #1739

[TimothyMakkison]

Hey @belav , I see you switched from strategy of migrating to a new property and instead opted to extend the existing one to be Boolean.

Did you confirm that this won't cause existing projects to ignore the global setting? My comment here goes into more detail.
I'm assuming Boolean defaults to null so any newly opened projects will use the global settings and won't have this issue.

I'm not sure how to test this, but I suspect it will be really annoying for users of it behaves this way

[belav]

@TimothyMakkison I confirmed that things all work as I expect them to. If an existing project has a value set it will ignore the global value. That is how it is supposed to work.