BandLimitedWave: provide wavetables as pre-generated "bin" files, these will be installed under datadir/wavetables

The runtime-generation is still there as a fallback, and the file generation code is left in as commented-out, because
it might be needed in the future

data/CMakeLists.txt

@@ -4,6 +4,7 @@ ADD_SUBDIRECTORY(presets)
 ADD_SUBDIRECTORY(projects)
 ADD_SUBDIRECTORY(samples)
 ADD_SUBDIRECTORY(themes)
+ADD_SUBDIRECTORY(wavetables)
 
 IF(LMMS_BUILD_LINUX)
    INSTALL(FILES themes/default/icon.png DESTINATION "${DATA_DIR}/pixmaps" RENAME lmms.png)

data/wavetables/CMakeLists.txt

@@ -0,0 +1,2 @@
+FILE(GLOB WAVETABLES *.bin)
+INSTALL(FILES ${WAVETABLES} DESTINATION "${LMMS_DATA_DIR}/wavetables")