dshowsrcwrapper: Initial attempt to port to 1.0
Added VS2012 project for dshowsrcwrapper
Updated VS project paths to use environment variables
dshowsrcwrapper: some cleanup of commented code and deprecated APIs
dshowvidesrc: Added JPEG video caps
dshowaudiosrc: fixed segsize calculation
Try to handle setting caps when internal DirectShow graph has already
started.
dshowaudiosrc: Handle reconfigure if caps are the same.
dshowvideosrc: Some caps cleanup.
dshowsrcwrapper: Fill in property getters, remove some dead code.