bt command output is different from crash's

Add proper QEMU Machine Protocol commands for reading/writing memory and getting vmcoreinfo

linux_helper_direct_mapping_offset() fails on Xen guests

Can we support small vmcore ?

Crash command: kmem -S, -P, -f <address>

Address translation loops when doing arm64 dump analysis

Support loading ramdump

gcore.py generates coredumps with broken thread stacks in gdb

Crash command: bpf: add -p, -P, -m, -M, -s, -x, and -d

Crash command: log: add -d, -m, and -c