Add EON Steel gas change event parsing
Add EON Steel gas change event parsing

The really sad part is that the EON Steel handles gas change events
correctly, by actually saying which cylinder it switches to.  But the
libdivecomputer interfaces are broken, and only contain the gas *mix*
you switch to, which is ambiguous since you could have the same mix in
multiple cylinders.

Maybe we could put the one-based cylinder index into the "flags" field?
With zero meaning "unknown". That would be a straightforward extension.

Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

glance-/libdivecomputer,Poltsi/libdivecomputer-vms,henrik242/libdivecomputer,glance-/libdivecomputer,henrik242/libdivecomputer