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/document-new-small.xpm

@@ -0,0 +1,81 @@
+/* XPM */
+static const char *document_new_small[] = {
+/* columns rows colors chars-per-pixel */
+"16 16 59 1",
+"  c #F9EF1E",
+". c #F6EC24",
+"X c #FAEF22",
+"o c #F4EB28",
+"O c #FAF022",
+"+ c #EDE436",
+"@ c #FCF43A",
+"# c #FBF23C",
+"$ c #8C8C7C",
+"% c #969677",
+"& c #9F9F72",
+"* c #AFAE6A",
+"= c #F7EF46",
+"- c #FCF343",
+"; c #FDF440",
+": c #FBF345",
+"> c #FBF346",
+", c #FAF24D",
+"< c #FAF24E",
+"1 c #F7EF5D",
+"2 c #F8F163",
+"3 c #F8F167",
+"4 c #FDF667",
+"5 c #F7F069",
+"6 c #F7F06A",
+"7 c #FDF668",
+"8 c #FDF56B",
+"9 c #FDF66A",
+"0 c #FDF66E",
+"q c #FDF771",
+"w c #FDF772",
+"e c #818181",
+"r c gray62",
+"t c #F4EF96",
+"y c #F2EE9B",
+"u c #F3EF9B",
+"i c #F2EE9C",
+"p c #F5F092",
+"a c #F5F09A",
+"s c #F1EEB1",
+"d c #F0EDB4",
+"f c #F3F0B1",
+"g c #FEFAB5",
+"h c #FEFAB8",
+"j c #FEFABB",
+"k c #FEFBBF",
+"l c #EFEEE0",
+"z c #EEEEE2",
+"x c #EAEAEA",
+"c c gray92",
+"v c #ECECEC",
+"b c gray93",
+"n c #EEEEEE",
+"m c #EFEFEF",
+"M c gray94",
+"N c #F1F1F1",
+"B c gray95",
+"V c gray100",
+"C c None",
+/* pixels */
+"reeeeeeee$&*+CCC",
+"eVVVVVVVVy6<=oCC",
+"eVvxxxvvd6@78# C",
+"eVxxvvvvi<4gh7XC",
+"eVxvxvvva<8hk8OC",
+"eVxvvvvvd3;ww-.C",
+"eVxxvvvvlp2-:2CC",
+"eVvvvvvMnzfpu%CC",
+"eVvvvvvMnMMMVeCC",
+"eVvvvvMvMnMMVeCC",
+"eVvvMMMMMBMMVeCC",
+"eVvvMvvMMMBBVeCC",
+"eVvvvMMMMMMMVeCC",
+"eVVVVVVVVVVVVeCC",
+"reeeeeeeeeeeerCC",
+"CCCCCCCCCCCCCCCC"
+};