- Drop support for the ancient TR1 and expect for compilers to at least support C++std11, while defaulting to C++std14.
- Propagate `MetaData` from the first of our ordered input archives over to the stitched output in `AbcStitcher`.
- Overhaul to support the recently released Imath 3.
Depends on D10998.
Signed-off-by: Martin Reboredo <firstname.lastname@example.org>