Towards a consistent design for laptop hotkey handling in Ubuntu

The Ubuntu 8.10 process highlighted the fact that we do not have a consistent architecture for how hotkeys work across different hardware in Ubuntu, and many of the developers do not have a clear understanding - or may have different understandings - of how the system is intended to work. The output of this blueprint will be an authoritative architecture description that developers can refer to when interacting with Ubuntu packages, to identify whether a given component is operating as intended; as well as a work list for changes to be made to bring Ubuntu into conformance with the target architecture, and a list of enhancements to make hotkey debugging easier.