Add remaining libs to CMake

These now all appear in the MSVC project.
Currently only FileDialog, Nyquist, mod-script-pipe compile and link, and Audacity compiles.
Still to set include directories and flags for most of the libs.

cmake-proxies/libflac++/CMakeLists.txt

@@ -0,0 +1,26 @@
+#directory cmake-proxies/libflac++
+#UNUSED
+set( TARGET libflac++ )
+set( TARGET_SOURCE ${LIB_SRC_DIRECTORY}${TARGET} )
+project( ${TARGET} )
+
+set( SOURCES 
+${LIB_SRC_DIRECTORY}libflac/src/libFLAC++/metadata.cpp
+${LIB_SRC_DIRECTORY}libflac/src/libFLAC++/stream_decoder.cpp
+${LIB_SRC_DIRECTORY}libflac/src/libFLAC++/stream_encoder.cpp
+${LIB_SRC_DIRECTORY}libflac/src/test_libFLAC++/decoders.cpp
+${LIB_SRC_DIRECTORY}libflac/src/test_libFLAC++/encoders.cpp
+${LIB_SRC_DIRECTORY}libflac/src/test_libFLAC++/main.cpp
+${LIB_SRC_DIRECTORY}libflac/src/test_libFLAC++/metadata.cpp
+${LIB_SRC_DIRECTORY}libflac/src/test_libFLAC++/metadata_manip.cpp
+${LIB_SRC_DIRECTORY}libflac/src/test_libFLAC++/metadata_object.cpp
+)
+# This defines the #define on both Windows and Linux.
+add_definitions(  )
+add_library( ${TARGET} STATIC ${SOURCES})
+
+target_include_directories( ${TARGET} PRIVATE 
+
+)
+
+target_link_libraries( ${TARGET} )