(io): cannot save json on mounted disk

Description

Create a custom rename function that will first try a std::filesystem::rename and then fallback to a basic copy-remove scenario.

Using this avoid the Invalid cross-device link error, when saving a json(z) file on a another disk/volume.

Closes #594 (closed)

How to test it?

Try to save a json from VRRender on a other disk with and without this MR.

NOTE: This need to be tested on windows, this may be unnecessary.

Additional tests to run

• Linux
• Windows (maybe not useful on windows)