Ffconverter

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* Move trimesh/gmsh to optional dependencies

* Add missing 3D Formats

* Add instructions for ARM users on how to install (compile) GMSH

* Add proper handling of unexpected missing gmsh

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* Fix dependency checking for trimesh

* Add trimesh (and gmsh) as dependencies in setup.py,
users can choose to remove these afterwards.

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* Fix icon on Wayland (Fix Issue 13)

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* Added trimesh/gmsh to support 3D-Models (close 11)

* Fixed crash when using drag-and-drop (close 12)

* When set to only show common file types, still show uncommon ones
if no common types are available

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* Added Caching to all_supported_conversions and missing to make
starting the program faster.

* Fix Issue 10: Will now no longer freeze if the external program is
missing when called by progress.py

* Stop a error message by WSL that would display when the program
checks and doesn't find a dependency in WSL

* Will now work with the magick command "convert" installed in WSL

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* Removed unneeded print() left in by accident

* fix imagemagick conversion being broken with old versions of imagemagick