Pwntools-elf-only

- [1204][1204] Reduce ROP cache filename length
- [1175][1175] Fix nested SSH connectors
- [1355][1355] Fix 'break' syscall
- [1277][1277] Fix timeout parameter passing in sendlineafter and other similar functions
- [1292][1292] Provide correct arch name to gdb for sparc64

[1175]: https://github.com/Gallopsled/pwntools/pull/1175
[1204]: https://github.com/Gallopsled/pwntools/pull/1204
[1277]: https://github.com/Gallopsled/pwntools/pull/1277
[1292]: https://github.com/Gallopsled/pwntools/pull/1292
[1355]: https://github.com/Gallopsled/pwntools/pull/1355

- [1242][1242] Use IntervalTree 2.xx, disallow use of 3.xx
- [1243][1243] Fix a typo that caused an exception when executing a binary with `process()` which returns `-ENOEXEC` and the system does not have `qemu-user` binaries installed.

[1242]: https://github.com/Gallopsled/pwntools/pull/1242
[1243]: https://github.com/Gallopsled/pwntools/pull/1243