Make python mainmodule a pointer

See merge request !237

Pybind 2.9.2

See merge request !236

Clean up: remove unused remnants of `optionFiles_`.

See merge request !235

Fix missing dirSeparator & print ini file locations:

See merge request !234

Clicking "apply" or "ok" in the options menu created a file
~/OpenFlipperOpenFlipper.ini

When fixing this, I also lightly refactored the code to remove
duplicate filename computation.

There still are things left to do for the next person:
    - Factor out remaining duplicate code - why is there an extra
      function just for keybindings?
    - Figure out how that global variable containing the list
      of option files should be used, or if we really want it.
    - Find out why we still have multiple local configfiles

Use different iterator style for map

See merge request !233

Cmake jan (Translations and reduced includes

See merge request !232

Updated mean curvature

See merge request !231

updated circulators for function gauss_curvature

See merge request !229

added standard search paths for dependencies installed via homebrew on Mac M1

See merge request !228