Fix broken default constructors

[csimal]

Christmas is coming early!

This PR addresses #28 .

• Added tests to check that every system has a default constructor.
• Fixed one dimensional systems that used scalar values for their state.
• Added missing default values for coupledstandardmaps andlorenz96. I picked what seemed like reasonable defaults.
• Fixed the docstring for kuramoto, which was slightly out of date.
• Removed trailing whitespaces (it looks like my editor did that automatically)

All tests pass, except for the hindmarshrose_two_coupled constructor, which seems to be missing a parameter (c). I don't know what a good value for it would be, so, if you can think of one, I can add it in.

[Datseris]

Thanks, this is great; just put the value 1 for c.

[csimal]

Done! There was another error in the same function, which seemed to just be mismatched variable names.

All test pass now, on Julia 1.11.2

[Datseris]

Thanks, it was really nice that you added these simple tests. It really does a huge difference.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 46.15385% with 21 lines in your changes missing coverage. Please review.

Project coverage is 80.94%. Comparing base (9fbc2dc) to head (ea3bb0f).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/continuous_famous_systems.jl	21.42%	11 Missing ⚠️
src/discrete_famous_systems.jl	60.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #29       +/-   ##
==========================================
+ Coverage   0.50%   80.94%   +80.43%     
==========================================
  Files          3        2        -1     
  Lines        789      808       +19     
==========================================
+ Hits           4      654      +650     
+ Misses       785      154      -631     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.