irq: Hide irq_force_return()
irq: Drop TRAPA API
treewide: Use <kos/irq.h> when applicable
irq: Move arch-agnostic IRQ functions to <kos/irq.h>
Move IRQ types to a new <kos/irq.h> include
irq: Update prototype of irq_create_context()
addons: Use KOS' C standard for addons, disable pedantic
spinlock: Restrict use to C only.