* more nyx hypercalls implemented, among them:
- panic hypercall
- range filtering hypercall
* fixed some nyx hypercalls behavior.
* added generic read / write to qemu memory
* port linux kernel example to also have nyx API, add better filtering as well.
* make nyx api structs volatile to avoid optimization issues
* Introduce a method create a Vec in place, using a closure.
* use new vec_init function in relevant places.
* removed unused unsafe keywork
* add more allocated memory r/w callbacks
* add more safety notes
* move emulator hooks to separate struct
* update QEMU version
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