Used for low-level system keymappings via keyszer.
This program injects into udev/* input files to create mappings
to make universal symbol layout possible.
It has quite a lot of possibilities because of it's rich api and python
environment. For example, it can use different keymappings table
depending on current application. But for now Keymappings__Engine still seems like
a better candidate because of system-agnostic nature and overall more flexible
api. So for now it's Keymappings__Engine domain to create mappings for
interacting with apps, while ahk, karabiner and keyszer better handle
low-level remaps (the reason engine wasn't used for this is because of
intricate problems with win key remaps).