Use `target remote` for remote connections

[hugsy]

Description

This PR obsoletes gef-remote to be completely replaced by pre and post hooks on target remote directly. We use some heuristics to determine what type of remote we're connected to reliably. In some old qemu, we still have to mock a memory layout, but the whole sync thing is not necessary any longer.

Fixes #1080 Fixes #1128

Checklist

• [x] My code follows the code style of this project.
• [x] My change includes a change to the documentation, if required.
• [x] If my change adds new code, adequate tests have been added.
• [x] I have read and agree to the CONTRIBUTING document.

[github-actions[bot]]

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🤖 Coverage update for 7973a3f279198965f3919b27b0d702dde7ff9cd1 🔴

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🤖 Coverage update for 7d2ef176193d047466f5c3e741ef0e5dceea0bb0 🟢

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[micsthepick]

when running the following arm program:

sudo chroot squashfs_root_bb qemu-arm-static -g 241 /usr/bin/env -i HOME=/ PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "SHELL=/bin/sh" LD_PRELOAD=/fw_hacks.so datalib

the main branch works fine with the follwing:

gdb-multiarch -nx -ex "source ~/.gef-main.py" -ex "set sysroot $(pwd)/squashfs_root_bb/" -ex "gef-remote --qemu-user --qemu-binary squashfs_root_bb/usr/bin/env localhost 241"

but using the gef from this branch is failing:

gdb-multiarch -nx -ex "source ~/.gef-revisit-target-remote.py" -ex "set sysroot $(pwd)/squashfs_root_bb/" -ex "target remote :241"

will there be a workaround?

[hugsy]

@micsthepick I think you need to provide the file