Add documentation on using gdb

Do not discard .debug section

Do not discard the .debug section. If the builder would like to discard
this section, they can do so explicitly with objcopy.

Update debugging code

Fix for the latest nightly

elf.rs: do not inline constant from goblin library

SELFMAG is declared [here](https://github.com/m4b/goblin/blob/de8aecc8f1e7f3de7d66a1511d3976cdf0335e0c/src/elf/header.rs#L91).

add a LOC badge

Migrate from collections

Add sys:syscall for seeing active system calls

Implement interrupt on signal in pipe:

Update to `bitflags` version 1.0

Capability mode support using null namespace

 Deduplicate memcpy, memmove, memset and memcmp functions