[3.0] Menu issues (problem with changing disks, there's no disk eject)

[Geist-zz]

Steps to reproduce:

1. Start JPC
2. Wait for FreeDOS to boot
3. Change floppy disk to another image
4. Reset

What should happened:
New image should boot.

What happens:
Menu shows new disk image inserted, but instead FreeDOS is booted again.

Feature request: possibility of ejecting disks (floppy/hd/cdrom) from menu.

[SonicFan2020-best]

This should be added, so you wouldn't have to exit the emulator and open it up again to get it to boot.