Gamepad fixes

[sezanzeb]

closes #1152 and #893

Fixes:

• Mapping a combination onto dpad-right keeps an uncombined dpad-right working now
• Default deadzone for mapping joysticks to keys (analog_threshold) is 30 now, instead of 1. This makes recording joystick movement a lot easier, because it won't record both ABS_X and ABS_Y all the time for tiny movements
• If only one direction of a joystick or the dpad was mapped, the other direction was not forwarded
• When mapping triggers to keys, they are now correctly counted as released when not pressed, instead of a negative joystick direction

Quality:

• Added mechanism that logs EV_ABS and EV_REL events without flooding the terminal
• Added test for gamepads with a joystick abs range of 0 to +256 (instead of -32768 to +32768)
• Handlers are not overwriting event values anymore. They set an attribute instead for on/off ("pressed")
• Split test_event_pipeline file to multiple with one class per file
• Comments and cleanup
• Added more typehints, fixed a few mypy errors
• Stricter typing for the methods and functions that print the structure of the MappingHandlers

TODO:

• check if using EV_REL as input still works

Automated tests for the:

• unmapped direction of a joystick fix
• dbad combination fix
• trigger fix