Fix UAF when deleting hook while in hook callback #1127 (#1130)

* Handle the cpu context save in a more pythonic way, so the context can be serialized and reuse in an other process using the same emulator architecture and modes

* Fix type error ; mistakes a size_t uint64_t ; breaks in 32bit...

* Fix the UAF situation when deleting a hook while being in a hook callback. Added an attribute 'to_delete' to hooks, and a list hooks_to_del to delay the free of the hooks

* Minor fixes ; forgot return type of clear_deleted_hooks ; do not declare variable in for predicate

include/list.h

@@ -27,4 +27,7 @@ void *list_append(struct list *list, void *data);
 // returns true if entry was removed, false otherwise
 bool list_remove(struct list *list, void *data);
 
+// returns true if the data exists in the list
+bool list_exists(struct list *list, void *data);
+
 #endif