[Confluence] add fallback background - fixes #15429
Read and expose axis-to-trigger mappings from keymap
Add trigger attributes in 360 controller linux keymap
Handle non-zero centered axes (i.e. triggers) more sanely
Pass keymap extracted by CButtonTranslator to CJoystick
Fix handling of multiple joysticks
Fix multiple joystick handling under windows, and fix desynched CJoystick API
Bypass deadzone on triggers