Rigid system

[svchb]

Based on #498

[codecov]

Codecov Report

Attention: Patch coverage is 7.85714% with 129 lines in your changes are missing coverage. Please review.

Project coverage is 67.28%. Comparing base (c36e13d) to head (d8450e4).

Files	Patch %	Lines
src/schemes/solid/rigid_body_sph/system.jl	0.00%	80 Missing ⚠️
src/schemes/solid/rigid_body_sph/rhs.jl	0.00%	36 Missing ⚠️
...chemes/boundary/dummy_particles/dummy_particles.jl	60.00%	6 Missing ⚠️
src/visualization/write2vtk.jl	0.00%	4 Missing ⚠️
src/general/semidiscretization.jl	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #522      +/-   ##
==========================================
- Coverage   69.27%   67.28%   -1.99%     
==========================================
  Files          69       71       +2     
  Lines        3967     4084     +117     
==========================================
  Hits         2748     2748              
- Misses       1219     1336     +117     

Flag	Coverage Δ
unit	67.28% <7.85%> (-1.99%)	⬇️

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