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-copy-small.xpm

@@ -0,0 +1,49 @@
+/* XPM */
+static const char *edit_copy_small[] = {
+/* columns rows colors chars-per-pixel */
+"16 16 27 1",
+"  c #888A85",
+". c #898B86",
+"X c #8A8C87",
+"o c #8C8E89",
+"O c #8D8F8A",
+"+ c #989A95",
+"@ c #989A96",
+"# c #9A9B97",
+"$ c #C3C4C3",
+"% c #C7C7C6",
+"& c gray83",
+"* c #E3E3E2",
+"= c #E3E4E2",
+"- c #EEEEEE",
+"; c #F0F0EF",
+": c #F3F3F3",
+"> c #F4F4F4",
+", c #F6F6F5",
+"< c #F7F7F6",
+"1 c #F8F8F7",
+"2 c #FAFAF9",
+"3 c gray98",
+"4 c #FBFBFB",
+"5 c #FCFCFB",
+"6 c #FEFEFD",
+"7 c gray100",
+"8 c None",
+/* pixels */
+"8888888888888888",
+"8888888888888888",
+"8888888888888888",
+"8888# ... . . .O",
+"8888X7777777777.",
+"8888.7;;;;;;-;7.",
+"8888X7;%%%%%%;7 ",
+"8888.7;;;;;;;-7 ",
+"8888.7;%%%%%;;7.",
+"8888.7;;;;;-;2:.",
+"8888o7;%%%%%-,$ ",
+"8888.7;;;;;OOoo ",
+"8888.7;;;;2+2,=.",
+"8888.2;;;22+2* .",
+"8888.><,54&+*.88",
+"8888o.       888"
+};