Also fix some Seek methods return types being unsigned, while returning
negative errors.
Added the CHECK_ASSERTION macro checks in a couple more places.
Simplified CHECK_ASSERTION macro usage.
May be connected to real data after those related save data list get implemented, with those data sent to UI decided.
Also removed some comments from Auto-Pause.
You can easily configure it as what you do for VHD/VFS.
To disable/enable Auto-Pause, find the configuration checkboxes from HLE/Misc panel in Config->Setting of rpcs3.