Modify vessel generator

[pauljuerss]

The vessel phantom generator has been modified to make it much easier to find parameters for good-looking phantoms.

Notable changes

• add keyword arguments for parameters that were previously inaccessible
• the generated route of vessels is now independent of the size of the volume
• introduce minimum splitting angle to reduce vessel overlap after splitting
• add parameter max_number_splits to limit the number of splits
• separate function body of vesselPath into different functions
• smooth final phantom
• add 2D support

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (90d0192) to head (9f8a86b).

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #12      +/-   ##
===========================================
+ Coverage   98.79%   100.00%   +1.20%     
===========================================
  Files           3         3              
  Lines          83        91       +8     
===========================================
+ Hits           82        91       +9     
+ Misses          1         0       -1     

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