* Update all drivers to add context's size information.
* Isolate the driver module from the kernel module.
* Isolate the CPU "driver" from the kernel module.
* Isolate the Gint "world switch" from the kernel module.
* Generate two worlds: Gint and Casio (see <src/kernel/kernel.c>).
* Add atomic (SR.IMASK=15) functions.
* Allow to overwrite the Gint "world switch" (gint_switch()).