[test][tracer] Separate properties into their own header

See merge request !2538

[test][freeflow] Separate properties into their own header

See merge request !2537

[md][embedded] Factor out sin/cos precomputation

See merge request !2536

[gridmanager] Add interface to query for existence of grid data

See merge request !2534

Feature/timestep methods

See merge request !2296

Based on initial draft by Timo Koch.

[md][newton] Fixup conflict in solutionChanged between !2291 and !2527

See merge request !2533

[propertysystem] Some cleanup

See merge request !2512

[newton] Fixup solution reset in line search update after !2291

See merge request !2532

Feature/newton linesearch

See merge request !2507

Bump package versions.

See merge request !2518

Fix/multidomain newton residual

See merge request !2527

Feature/newton variables backend

See merge request !2291

In case the default (non-experimental) assembly is used, the variables 
type is of type SolutionVector, so this is backwards-compatible with 
current derived classes.

This implementation should be replaced as soon as the new assembly is
available. For now, this tests if NewtonSolver supports the new grid
variables-based assembly.