single zndraw config API

[PythonFZ]

combine Scene and Arrow config API to be united in vis.config

• enable UI changes again
• update UI elements via schema (can also e.g. append to dropdowns so preferred over setValue)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 62.96296% with 40 lines in your changes missing coverage. Please review.

Project coverage is 56.53%. Comparing base (0ecde2b) to head (198a104).

Files	Patch %	Lines
tests/test_config.py	40.62%	19 Missing ⚠️
zndraw/server/events.py	29.16%	17 Missing ⚠️
zndraw/utils.py	77.77%	2 Missing ⚠️
zndraw/scene.py	94.11%	1 Missing ⚠️
zndraw/zndraw.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #609      +/-   ##
==========================================
+ Coverage   54.65%   56.53%   +1.88%     
==========================================
  Files          33       34       +1     
  Lines        2644     2722      +78     
==========================================
+ Hits         1445     1539      +94     
+ Misses       1199     1183      -16     

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