F3D: Update help text for new types

[mwestphal]

• Parse camera-view-up as a direction
• Update direction related integration testing
• Update help text for direction and factor
• Update doc for direction and factor
• Add conversion from direction_t to vector3_t
• Remove C++11 related point3 and vector3 constructor

[github-actions]

You are modifying libf3d public API! ⚠️Please update bindings accordingly⚠️!
You can find them in their respective directories: python, java, webassembly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.79%. Comparing base (c7f7a99) to head (09ea5f4).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2044      +/-   ##
==========================================
- Coverage   95.80%   95.79%   -0.02%     
==========================================
  Files         128      128              
  Lines       10488    10481       -7     
==========================================
- Hits        10048    10040       -8     
- Misses        440      441       +1     

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