fix(dmplex): Replace CGNS scoped typedefs

The change allows a CGNS to be used even if it doesn't set the
`CGNS_ENABLE_SCOPING` flag. CGNS sets the value of the `CGNS_ENUMT` (and
other) macros to lim

fix(dmplex): Replace CGNS scoped typedefs

The change allows a CGNS to be used even if it doesn't set the
`CGNS_ENABLE_SCOPING` flag. CGNS sets the value of the `CGNS_ENUMT` (and
other) macros to limit the scope of it's types. Note
`CGNS_ENUMT(ElementType_t)` is already used in other places, so this
makes the behavior more consistent.

Fixes #1233

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fix mixture of all caps and not all caps for SUBMANSEC for DMPLEX and friends

Commit-type: bug-fix, documentation
/spend 50m

DMPlex: add support for writing CGNS files in parallel

Also --download-cgns. This supports most kinds of quadratic and
cubic elements, plus some quartic (not supported in Paraview-5.10.1).
Parallel

DMPlex: add support for writing CGNS files in parallel

Also --download-cgns. This supports most kinds of quadratic and
cubic elements, plus some quartic (not supported in Paraview-5.10.1).
Parallel IO uses collective contiguous writes.

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