Fix scale sensitivity

[rainman110]

This PR fixes global scale sensitivity behavior.

Before, scaling up a curve network by some orders on magnitude could result in unsuccessful execution.

There were two places, that contained scale sensitivity:

1. The computation of the curve curve intersection uses a local optimization. The objective function (point distance) was scale sensitive, resulting in different stopping behaviour. This is now fixed by normalizing the objective function by the local scale.
2. The reparametrization also contained a scale sensitive stopping criterion, resulting in different run times depending on scale.

[github-actions]

Test Results

83 tests  ±0   83 ✅ ±0   1s ⏱️ -2s
 9 suites ±0    0 💤 ±0 
 2 files   ±0    0 ❌ ±0 

Results for commit 6eabde4. ± Comparison against base commit 1112ef1.