Feature request: search for pointers to rwx memory

[disconnect3d]

It would be nice to have a way to find pointers to memory pages with certain permissions, like RWX, either on a memory range or on a memory page name.

This feature was requested by one of our users.

Ideally, this should probably be a flag/implementation change into one of p2p, probeleak or leakfind commands, so that we don't create another command that does a similar thing.