Continued disk logging

prety much all values are now exported. Channel names are mostly the
same as in iRacing.
Added framework for messages

basic framework added to receive and handle iRacing broadcast messages.
(switch cams, etc)
needs to export some channels, at least for live-logging, that are not
actually present in rFactor to keep compatibillity with existing apps.
(at least irSDKSharp - used for testing)