Apps converted to a callable no longer log in real time

[jessemapel]

ISIS version(s) affected: varies by app. Conversion started at 3.7, so 3.7+

Description

Apps that have been converted to a callable function no longer log directly to the application, instead they log to a PVL object and then upon completion log its whole contents to the application.

How to reproduce

This is most notable with jigsaw. If you run jigsaw in ISIS 4.4 or later it won't log until it reaches the very end of the process.

Possible Solution

One possible solution is to create a logger object that logs things, if possible, as we add to it. This would be similar to the current Application::log function, but it would be an object passed into function calls similar to our process objects.

[lwellerastro]

This doesn't seem to be an issue for most programs that run quickly, but it's very noticeable with jigsaw which can take > 1 hour to run even a single iteration on some networks. It makes it hard to see what is happening particularly with cluster runs when you are already in the dark.

[Kelvinrr]

The best approach to this might be to subclass Pvl and have a log object that reports as things are added with Applcation::Log even without an iApp instance. That way we can still return the results as PVL and not have to update every callable.

[Kelvinrr]

idk why I thought a new class was gonna be easier, it required updating way more stuff manually. Decided to make a new function instead which made things way easier to update.