[Matrix] Backport changes from Nexus

[garbear]

Description

This PR backports all non-Nexus-specific commits from the Nexus branch into the Matrix branch.

Related PRs

Includes:

• https://github.com/xbmc/peripheral.joystick/pull/231
• https://github.com/xbmc/peripheral.joystick/pull/232
• https://github.com/xbmc/peripheral.joystick/pull/233
• https://github.com/xbmc/peripheral.joystick/pull/234
• https://github.com/xbmc/peripheral.joystick/pull/235

[garbear]

Merging to release new versions for @razzeee's flatpack work.