Fix collinear direction and up vector bug

[skusel]

Describe your changes

Fixes an issue where the model would not appear if the camera position to focal point vector and up vector are collinear.

Fixes a bug where the model would disappear after pressing '7' for the top view and then attempting to change the perspective by clicking and dragging the mouse.

Issue ticket number and link if any

#2048

Checklist for finalizing the PR

• [x] I have performed a self-review of my code
• [x] I have added tests for new features and bugfixes
• [ ] I have added documentation for new features
• [ ] If it is a modifying the libf3d API, I have updated bindings
• [ ] If it is a modifying the .github/workflows/versions.json, I have updated timestamp

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.13%. Comparing base (ef2a2e1) to head (b7f9836). Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2296      +/-   ##
==========================================
+ Coverage   96.11%   96.13%   +0.02%     
==========================================
  Files         130      130              
  Lines       11701    11769      +68     
==========================================
+ Hits        11246    11314      +68     
  Misses        455      455              

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[mwestphal]

Nice work @skusel , however I'll let you reach consensus with @snoyer before approving anything :)

[mwestphal]

@snoyer please review :)