MIPS Corefile support

[Veryyes]

Currently pwntools does not support parsing coredumps that are from MIPS binaries. Would be nice if it did.

FYI: The current list of architectures supported: pwntools/pwnlib/elf/corefile.py:102

prstatus_types = {
    'i386': elf_prstatus_i386,
    'amd64': elf_prstatus_amd64,
    'arm': elf_prstatus_arm,
    'aarch64': elf_prstatus_aarch64
}

[Arusekk]

Do you want to try working on that?