Update and debug USB stack

This change will allow people to write drivers to support a wider range of USB devices. It will also improve stability and possibly also performance of the USB stack in general.

Details

• Two-pass Kernel keyboard scan (to allow power-on keys and simplify our HALs) – helps towards RISC OS Pi stable release
• NetBSD (USBDriver, OHCIDriver, EHCIDriver) component to split into separate components
• Internationalisation of the drivers
• Create some PRM and StrongHelp documentation.

A future bounty will bring everything up to a newer version of the originating OSS releases, add isochronous audio support and fix a couple of known bugs.

Donations	49
Total	£1,835.44
State	Underway
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