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/edit-clear-large.xpm

@@ -0,0 +1,210 @@
+/* XPM */
+static const char *edit_clear_large[] = {
+/* columns rows colors chars-per-pixel */
+"32 32 172 2",
+"   c #6E0200",
+".  c #720402",
+"X  c #740A02",
+"o  c #79130D",
+"O  c #890802",
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+"%  c #AA0000",
+"&  c #B70000",
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+";  c #86280B",
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+"W. c #FDF091",
+"Q. c #FEF5B4",
+"!. c #EEEEEC",
+"~. c None",
+/* pixels */
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+"~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~."
+};