Pwntools-elf-only

- [981][981] Fixed RELRO detection logic
- [986][986] Enhancements to DynELF for controlling usage of LibcDB
- A few documentation fixes
- A few fixes for the Docker image

[981]: https://github.com/Gallopsled/pwntools/pull/981
[986]: https://github.com/Gallopsled/pwntools/pull/986

- [998][998] Fix a bug where integer values could not be set in `.pwn.conf`.

[998]: https://github.com/Gallopsled/pwntools/pull/998

- [933][933] DynELF works better with different base addresses
- [952][952] A few small fixes were made to `pwn template`, and the CRC database was updated.
- [5c72d62c][5c72d62c] Updated the CRC database

[933]: https://github.com/Gallopsled/pwntools/pull/933
[952]: https://github.com/Gallopsled/pwntools/pull/952
[5c72d62c]: https://github.com/Gallopsled/pwntools/commit/5c72d62c