move old debugger

[well-mannered-goat]

Your checklist for this pull request

• [x] I've read the guidelines for contributing to this repository.
• [x] I made sure to follow the project's coding style.
• [ ] I've documented every RZ_API function and struct this PR changes.
• [ ] I've added tests that prove my changes are effective (required for changes to RZ_API).
• [ ] I've updated the Rizin book with the relevant information (if needed).

Detailed description

• Moved the debugger code into the debug/old/ directory.
• Added use_old_debugger meson option which is by default true
• Refactored wherever old debugger plugins were used

Test plan

...

Closing issues

...

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 44.89%. Comparing base (5b131b6) to head (758fe90). Report is 3 commits behind head on dev.

Additional details and impacted files

Files with missing lines	Coverage Δ
librz/core/cmd/cmd_debug.c	22.32% <ø> (ø)
librz/debug/old/bp.c	56.80% <ø> (ø)
librz/debug/old/bp_io.c	70.00% <ø> (ø)
librz/debug/old/bp_traptrace.c	3.88% <ø> (ø)
librz/debug/old/bp_watch.c	50.00% <ø> (ø)
librz/debug/old/ddesc.c	30.76% <ø> (ø)
librz/debug/old/debug.c	43.99% <ø> (ø)
librz/debug/old/desil.c	38.54% <ø> (ø)
librz/debug/old/dmap.c	56.89% <ø> (ø)
librz/debug/old/dreg.c	48.64% <ø> (ø)
... and 36 more

... and 13 files with indirect coverage changes

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