A Warning when low on memory / Stop the program causing a BSOD.

## Is your feature request related to a problem?
My system only has 16gb of ddr3 system ram (and a B580 with 12gb vram) - it can cope with loading the low quality text to image models, but if you try pro/high quality the system uses up all available memory and will BSOD with: IRQL_NOT_LESS_OR_EQUAL even when set to low resolution.

## Describe the solution you'd like.
If the program is about to run out of memory, kill the task rather than the computer.

## Describe alternatives you've considered
If I could afford more ram...