Adding check for diskpace during making screenshots

Even if you run out disk space (precisely if you have 300KB not sufficing for saving PNG), after you press Print Screen, it will still show that screenshot is saved successfully while it saves only 0B file.
>Would be nice to have error shown in such case.

To tell the truth, corrupted screenshot image files are least of your problems if you let your hdd that full. Of course, if that is pure data drive without any running programs, that might not be the case.

Corrupted images are usually not a big issue unless you were doing them for let's say two hours thinking everything is fine.
I just left not so many diskspace.

Fixed in github.com/crosire/reshade/commit/198e28...ab596544963d6ffe1feb