[PROJ] Motion: whole code-base reformatting

[Even Rouault]

Hi,

I guess this deserves formal PSC approval: 
https://github.com/OSGeo/PROJ/pull/3590

Basically this generalizes the formatting rules that have been applied 
to the code added since PROJ >= 6 to the rest of the code base and adds 
automation through pre-commit to apply those formatting rules at git 
commit time.

Starting with my +1

Even

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