Cleaning up lib-src

FileDialog goes into audacity/src/widgets and the mod-* directories go into
audacity/modules.

This leaves nothing in lib-src that isn't a 3rd-party libs or supporting
files.

modules/mod-nyq-bench/images/media-playback-stop-small.xpm

@@ -0,0 +1,77 @@
+/* XPM */
+static const char *media_playback_stop_small[] = {
+/* columns rows colors chars-per-pixel */
+"16 16 55 1",
+"  c #545652",
+". c #555753",
+"X c #595B57",
+"o c #5C5E5A",
+"O c #5D5F5B",
+"+ c #5F615D",
+"@ c #60625E",
+"# c #626460",
+"$ c #636661",
+"% c #656763",
+"& c #676964",
+"* c #696B66",
+"= c #6A6C68",
+"- c #6C6E69",
+"; c #6D706B",
+": c #6F716C",
+"> c #70736E",
+", c #72746F",
+"< c #737570",
+"1 c #D3D7CF",
+"2 c #D5D9D1",
+"3 c #D7DBD3",
+"4 c #D7DBD4",
+"5 c #D8DBD4",
+"6 c #D8DBD5",
+"7 c #DBDED8",
+"8 c #DCDFD8",
+"9 c #DDE0DA",
+"0 c #DEE1DB",
+"q c #DFE2DC",
+"w c #E0E2DD",
+"e c #E0E3DD",
+"r c #E1E4DF",
+"t c #E3E5E0",
+"y c #E3E6E1",
+"u c #E4E7E2",
+"i c #E6E8E4",
+"p c #E6E9E4",
+"a c #E7E9E4",
+"s c #E7E9E5",
+"d c #E8EAE6",
+"f c #EAEBE8",
+"g c #EBEDEA",
+"h c #EDEEEB",
+"j c #EEEFEC",
+"k c #EFF1EE",
+"l c #F0F1EF",
+"z c #F0F2EF",
+"x c #F3F4F2",
+"c c #F7F8F6",
+"v c #F7F8F7",
+"b c #F8F8F7",
+"n c #FDFDFD",
+"m c gray100",
+"M c None",
+/* pixels */
+"MMMMMMMMMMMMMMMM",
+"MMMMMMMMMMMMMMMM",
+"MMMMMMMMMMMMMMMM",
+"MMM ... .....MMM",
+"MMMXmmmmmmmmXMMM",
+"MMMom8rgkcmm+MMM",
+"MMM+mqihxccm@MMM",
+"MMM#mrigjxjm#MMM",
+"MMM%mquiiium&MMM",
+"MMM*m00wwq7m=MMM",
+"MMM-m545421m;MMM",
+"MMM:mmmmmmmm>MMM",
+"MMM,<<<<<<<<<MMM",
+"MMMMMMMMMMMMMMMM",
+"MMMMMMMMMMMMMMMM",
+"MMMMMMMMMMMMMMMM"
+};