[assembly][cvfe] Unify CVFE assembly
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Unify the local and subdomain assemblers for CVFE -
Unify treatment for fcdiamond on the boundary, treat like other CVFE schemes (non-compatible change) -
Add changelog entry for fcdiamond -
Remove obsolete local assemblers
depends on !3460 (merged) because it adopts that bugfix to all CVFE schemes.
Edited by Timo Koch