"Application actions" should allow validation

[skurfer]

Actions defined under QSApplicationActions are displayed for the application unconditionally. They should support validation like QSActions.

Use case: You might want to show different actions depending on whether or not the application is running.

Related: When looking into this, make sure precedence is respected for application actions as well. I'm not sure if it is.

[skurfer]

Another issue: When used in triggers, application actions seem to quit working after a restart. See #909 (comment)

[stale]

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