ci: Fix outdated actions

pci: Allow serial I/O base to be reset via UI when hotswapping

ci: Fix package installation

The following line may cause the Xbox to enter overheat mode when in a 480p
mode. Updating the Conexant encoder registers will eventually disable the
EN_OUT bit anyway, so just enable it after update.

This makes it possible to enable or disable Serial COM1's interrupt so that
there is no conflict with NIC. Enabling IRQ for Serial COM1 (on by default)
will conflict with NIC (nvnet). Disabling the IRQ will disable serial input
(unless there's polling).

ui: Fix warnings caused by missing header prototypes

boot: Set front panel mode to 'auto'

xdecode: Port to C99 for portability

grub: Rewrite rawread function to fix array write out-of-bounds

boot: Add nested multisystem boot menu