🎨 Allow extra arguments to CIB_FATAL

[elbeno]

Problem:

• CIB_FATAL expects log arguments to be interpolated into the format string, but there is no way to pass extra arguments along to stdx::panic.

Solution:

• Use the format_result tuple as the first argument to stdx::panic, and allow any further arguments passed to CIB_FATAL to be forwarded through.

Note:

• Splitting a tuple may be worthwhile to move to stdx in due course. Surprisingly I don't think we've had cause for it yet. And since clang backports pack indexing, when that is available we can use it without pulling in stdx::tuple.