Create assert memory tracking to shut down unused references

[PeteHorn]

Feedback from GDevCon that this is worth doing - no idea how though

[PeteHorn]

Had a quick think about how to do this, looking through forums to see if there is a way of getting an event when a vi drops out of memory - nothing....

Could poll through all the calling vi's at regular intervals to monitor their execution state and shut down if they are idle or bad. This seems inefficient but I think the only possible way of doing it. Maybe only poll every 30 secs or something, or take a 100ms break every X callers to avoid it sucking CPU power too much.

[PeteHorn]

Started to think about this - added some new flags in to the config file with default values to manage how garbage/reference collection should work.

[PeteHorn]

[PeteHorn]

Created a process monitor actor which will have to be called from each assert vi. These should all test to see if it is open, and if not open it. If it is then get a reference to the one thats open - only ever want one instance of this open.

Then determine how to identify dead references (potentially through polling) and how to determine when the process monitor itself should be shut down....