switch to SimpleUnPack.jl

[ranocha]

Just use SimpleUnPack.jl - simplified version of #1367

[ranocha]

The test elixir_advection_shockcapturing.jl failed. I think this was caused by floating point differences and maybe CFL magic. While fixing the test, I realized it was using polydeg = 4 while we usually choose polydeg = 3 to reduce compilation times. I fixed that as well.

[codecov]

Codecov Report

Merging #1376 (a776f61) into main (a0fa4ae) will increase coverage by 25.76%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main    #1376       +/-   ##
===========================================
+ Coverage   70.20%   95.96%   +25.76%     
===========================================
  Files         344      344               
  Lines       28434    28499       +65     
===========================================
+ Hits        19960    27347     +7387     
+ Misses       8474     1152     -7322     

Flag	Coverage Δ
unittests	95.96% <100.00%> (+25.76%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ctured_1d_dgsem/elixir_advection_shockcapturing.jl	94.74% <ø> (ø)
src/Trixi.jl	71.43% <ø> (ø)
src/solvers/dgsem_tree/indicators_1d.jl	91.36% <100.00%> (+64.55%)	⬆️

... and 116 files with indirect coverage changes

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[ranocha]

Windows MPI fails again...