Updates the cmake build system

It's still has some work, but it successfully builds on
all 3 main platforms.  Some of the outstanding items
include:

   Install target testing (mostly important for Linux)
   CMakeList clean up and comments
   Debug and Release build verification
   Audit of compile/link options
   Need a Mac signed and notarized build
   (and probably more)

cmake-proxies/sbsms/CMakeLists.txt

@@ -1,31 +1,55 @@
-#directory cmake-proxies/sbsms
-set( TARGET sbsms )
-set( TARGET_SOURCE ${LIB_SRC_DIRECTORY}${TARGET} )
-project( ${TARGET} )
 
-set( SOURCES 
-${LIB_SRC_DIRECTORY}sbsms/src/buffer.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/dBTable.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/fft.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/grain.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/resample.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/sbsms.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/slide.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/sms.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/subband.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/track.cpp
-${LIB_SRC_DIRECTORY}sbsms/src/trackpoint.cpp
-)
-# This defines the #define on both Windows and Linux.
-add_definitions( 
--D_LIB
--DNDEBUG
- )
-add_library( ${TARGET} STATIC ${SOURCES})
+add_library( ${TARGET} STATIC )
 
-target_include_directories( ${TARGET} PRIVATE 
-${TARGET_SOURCE}/include
-${TARGET_SOURCE}/win
+list( APPEND SOURCES
+   PRIVATE
+      ${TARGET_ROOT}/src/buffer.cpp
+      ${TARGET_ROOT}/src/dBTable.cpp
+      ${TARGET_ROOT}/src/fft.cpp
+      ${TARGET_ROOT}/src/grain.cpp
+      ${TARGET_ROOT}/src/resample.cpp
+      ${TARGET_ROOT}/src/sbsms.cpp
+      ${TARGET_ROOT}/src/slide.cpp
+      ${TARGET_ROOT}/src/sms.cpp
+      ${TARGET_ROOT}/src/subband.cpp
+      ${TARGET_ROOT}/src/track.cpp
+      ${TARGET_ROOT}/src/trackpoint.cpp
 )
 
-target_link_libraries( ${TARGET} )
+list( APPEND INCLUDES
+   PRIVATE
+      ${CMAKE_CURRENT_BINARY_DIR}/private
+   PUBLIC
+      ${TARGET_ROOT}/include
+)
+
+list( APPEND OPTIONS
+   PRIVATE
+      $<$<C_COMPILER_ID:CLANG>:-Wno-enum-compare>
+      $<$<C_COMPILER_ID:GNU>:-Wno-enum-compare>
+)
+
+find_package( Threads )
+if( Threads_FOUND AND CMAKE_USE_PTHREADS_INIT )
+   set( MULTITHREADED 1 )
+endif()
+
+if( UNIX )
+   check_cxx_compiler_flag( "-msse" ENABLE_SSE )
+   if( ENABLE_SSE )
+      list( APPEND OPTIONS
+         PRIVATE -msse
+      )
+   endif()
+endif()
+
+configure_file( config.h.in private/config.h )
+
+organize_source( "${TARGET_ROOT}" "" "${SOURCES}" )
+target_sources( ${TARGET} PRIVATE ${SOURCES} )
+target_compile_definitions( ${TARGET} PRIVATE ${DEFINES} )
+target_compile_features( ${TARGET} PRIVATE ${FEATURES} )
+target_compile_options( ${TARGET} PRIVATE ${OPTIONS} )
+target_include_directories( ${TARGET} PRIVATE ${INCLUDES} )
+target_link_libraries( ${TARGET} PRIVATE ${LIBRARIES} )
+