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)

nyquist/CMakeLists.txt

@@ -0,0 +1,75 @@
+
+set( TARGET nyquist )
+set( TARGET_ROOT ${topdir}/nyquist )
+
+message( STATUS "========== Configuring ${TARGET} ==========" )
+
+def_vars()
+
+list( APPEND SOURCES
+   aud-do-support.lsp
+   dspprims.lsp
+   envelopes.lsp
+   equalizer.lsp
+   evalenv.lsp
+   fileio.lsp
+   init.lsp
+   misc.lsp
+   nyinit-dbg.lsp
+   nyinit.lsp
+   nyqmisc.lsp
+   nyquist.lsp
+   printrec.lsp
+   profile.lsp
+   sal-parse.lsp
+   sal.lsp
+   seq.lsp
+   seqfnint.lsp
+   seqmidi.lsp
+   sliders.lsp
+   sndfnint.lsp
+   spec-plot.lsp
+   spectral-analysis.lsp
+   stk.lsp
+   system.lsp
+   test.lsp
+   velocity.lsp
+   xlinit.lsp
+   xm.lsp
+   rawwaves/mand1.raw
+   rawwaves/mand10.raw
+   rawwaves/mand11.raw
+   rawwaves/mand12.raw
+   rawwaves/mand2.raw
+   rawwaves/mand3.raw
+   rawwaves/mand4.raw
+   rawwaves/mand5.raw
+   rawwaves/mand6.raw
+   rawwaves/mand7.raw
+   rawwaves/mand8.raw
+   rawwaves/mand9.raw
+   rawwaves/mandpluk.raw
+   rawwaves/marmstk1.raw
+   rawwaves/sinewave.raw
+)
+
+foreach( source ${SOURCES} )
+   set( src "${_SRCDIR}/${source}" )
+   set( dst "${_EXEDIR}/${TARGET}/${source}" )
+
+   add_custom_command(
+      DEPENDS
+         "${src}"
+      COMMAND
+         ${CMAKE_COMMAND} -E make_directory "${_EXEDIR}/${TARGET}"
+      COMMAND
+         ${CMAKE_COMMAND} -E copy "${src}" "${dst}"
+      OUTPUT
+         "${dst}"
+   )
+
+   list( APPEND OUTPUTS "${dst}" )
+endforeach()
+
+add_custom_target( ${TARGET} ALL DEPENDS ${OUTPUTS} SOURCES ${SOURCES} )
+