[SeveNIC8]

Introduce functions to manage disc operations, including checking the eject state, inserting, and ejecting discs. Update the menu to support these new disc operations.

[josegonzalez]

Did the existing code for changing discs within an m3u file not work? What does this add/fix?

[SeveNIC8]

Yes, it doesn't work (tested on the PUAE core). When loading an .m3u file, the first disk loads correctly. However, when the game prompts for a disk change and I select the correct one from the menu, nothing happens. The game remains stuck waiting for the disk change.

Looking at the status bar, I can see D0 (for DF0), but the track number never updates to show it's loading. Normally, when a disk is inserted, the label switches from D0 to the active track number.

I noticed that introducing an explicit eject/insert state cycle during the disk change forces the PUAE core to correctly register the transition. I now get a notification confirming the disk has been inserted or ejected, whereas previously, simply changing the disk did nothing.