Merge branch 'fix/move-constructible-fluidmatrix-wrapped-types' into 'master'

[fluidmatrix] Make member non-const to enable move-construction for temporaries

Closes #964 (closed)

See merge request !2378 (merged)

(cherry picked from commit 7473a2ca)

cfbb9052 [fluidmatrix] Make member non-const to enable move-construction for temporaries aff729f1 [fluidmatrix] Use standard forwarding pattern