MPAudioRenderer: Replaced $(SoludionDir) by relative path
MPAudioRenderer: added project reference to baseclasse, like it is already for TsReader
BDReader replaced SoludionDir by relative paths
BDReader added project reference to baseclasses, like it is already being done for DvbCoreUtils
TsWriter: replaced $(SolutionDir) by relative path
TsWriter: added project reference to baseclases, like it is already done for DvbCoreUtils