WIP: Add all routines to set up a voronoi mesh

[bennibolm]

Open issue for later: What variables do I actually need for the implementation of the FV method in Trixi.jl? For which variables does it make sense to convert the array to Julia-typical types (e.g. Int64) and when? Can't happen directly after creation, since the following routines require C types.

[sloede]

For which variables does it make sense to convert the array to Julia-typical types (e.g. Int64) and when? Can't happen directly after creation, since the following routines require C types.

Maybe we should just not convert anything to Julia types in this package and instead leave it to the user? Alternatively, we could provide additional methods for those functions that accept the return element type as the first argument, i.e., foo(arg1, arg2) gets foo(Float64, arg1, arg2) etc.

For now, though, I'd just remove the conversion to default Julia types as you did 👍

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3ccdfe1) 100.00% compared to head (2b0e6e7) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #6   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines            7        34   +27     
=========================================
+ Hits             7        34   +27     

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[bennibolm]

I will add the routine's doctrings in another PR. So, this one here is ready to review/merge. Do you @sloede @simonechiocchetti want to take a look before I merge it?

[sloede]

Not a real review (I will not be able to do this in general), but two minor thoughts