improve camera

[PythonFZ]

• fix synchronize camera
• try to clean up a bit
• reset up vector
• fix orthographic camera
• store zero vector
• fix controls

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 50.38%. Comparing base (1b20115) to head (c46115e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
zndraw/app.py	50.00%	1 Missing ⚠️
zndraw/config.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #730      +/-   ##
==========================================
- Coverage   50.38%   50.38%   -0.01%     
==========================================
  Files          38       38              
  Lines        2701     2705       +4     
==========================================
+ Hits         1361     1363       +2     
- Misses       1340     1342       +2     

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