A first attempt to test visualization code

[Tortar]

This is very rough, but at least we have something, so in my opinion it is nonetheless a good thing. Partially address #864

Notice that I needed to change "Zombie" in "Zombiee" in jld2tests.jl because it conflicted with the "Zombie" in the examples folder. This is caused by the current design of the agent macro which always evaluates the quote at the module scope. We should fix this

[codecov-commenter]

Codecov Report

Merging #888 (f2b977b) into main (e1e58a7) will increase coverage by 19.72%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main     #888       +/-   ##
===========================================
+ Coverage   72.72%   92.45%   +19.72%     
===========================================
  Files          42       32       -10     
  Lines        2871     2319      -552     
===========================================
+ Hits         2088     2144       +56     
+ Misses        783      175      -608     

Files Changed	Coverage Δ
src/core/model_abstract.jl	90.76% <100.00%> (ø)

... and 12 files with indirect coverage changes

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[Tortar]

As expected we got a big boost in coverage

[Datseris]

Evaluating code coverage in the plots folder was a mistake. I didn't realize it. We need to remove this, irrespectiveily of whether we test the plotting or not.

See here for how to remove folders from the coverage: https://github.com/JuliaDynamics/Attractors.jl/blob/main/codecov.yml

[Tortar]

Actually now the boost is even better :D