* special fxcg50 dupdate_noint() which display the content of the VRM without using the DMA (usefull for debugging)
@update
* update the drivers interface to get some information about the current running drivers' context
* remove the old cpu_setVBR() function
@fix
* fix cpu_setVBR() returned value
* fix kquit() drivers restore atomic error
* 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()).