debugger: Bugfixes

[elad335]

• Do not access IDM's containers when their FXO entry is inactive.
• Save smart thread pointers in the debugger instead of raw pointers.
• Fix segfault when a double click signal occurs after ui callstack has been cleared.
• Add return key press in addition to double click to jump to callstack item address.
• Fix debugger shortcuts when callstack is the focused widget.

Fixes #13865

[AniLeo]

@jbeich we have an issue with the FreeBSD CI

pkg: No packages available to install matching 'llvm16' have been found in the repositories

[jbeich]

FreeBSD package build failed unlike before. Probably due to a hardware/kernel hiccup. The package recipe had a change but for aarch64 and unlikely to break build on amd64.

llvm16 will re-apper in ~4 days. The next build will auto-start on Tuesday 01:00 UTC and may take ~2 days until completion. I've opened #13949 as a workaround and to fix an unrelated issue (upcoming 13.1 EOL).