Allow mixer devices to indicate the range of supported gain values
Detail: This adds support for version 0.1 of the HAL mixer device API. Mixer devices which implement this version of the API are able to indicate the min/max gain values each mixer supports, along with the smallest gain step. Docs/SoundCtrl - Updated to describe how this new information is exposed to RISC OS h/MixerDevice, hdr/MixerDevice - Updated mixer device structure definitions c/module - Added code to read gain information if present. Also fixed runtime mixer registration/deregistration to accept any device of version 0.x instead of 0.0 Admin: Tested in OMAP3 ROM & Tungsten ROM softload. Version 1.01. Tagged as 'SoundCtrl-1_01'
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