Merged switch to current SOX library (v14) and move of all local libs (for
Windows build) into the winlibs/ subdirectory. Of SOX, only add files
needing modification in mingw32 builds; on Linux, the system shared
library libsox is used. Local copy of old sox removed.
Updated copyright year; avg_q_ui/CMakeLists.txt: Fixed rule to generate
avg_q_rc.o (ADD_CUSTOM_COMMAND can take only one TARGET argument)