Swap installation order of Trixi.jl and LibTrixi.jl

[benegee]

Does this fix #190 ?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.27%. Comparing base (25d7014) to head (a5cb439).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #192   +/-   ##
=======================================
  Coverage   80.27%   80.27%           
=======================================
  Files          19       19           
  Lines         715      715           
  Branches       50       50           
=======================================
  Hits          574      574           
  Misses        137      137           
  Partials        4        4           

Flag	Coverage Δ
unittests	80.27% <100.00%> (ø)

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[benegee]

I also updated t8code's version to v2.0.0. Should have done that earlier, but it also seems to be necessary with the current version of Trixi.jl.

[benegee]

🙄
trixi-framework/Trixi.jl#1865 (which happens to be my own PR) changed the non-public-API nelementsglobal.

What to do? Restrict Trixi.jl version to >=0.7.16?

[sloede]

🙄 trixi-framework/Trixi.jl#1865 (which happens to be my own PR) changed the non-public-API nelementsglobal.

What to do? Restrict Trixi.jl version to >=0.7.16?

What do you mean? All tests seem to pass?!