Start on built-in LAME

Using LAME 3.10
Windows project files substantially changed from original, and included into audacity solution.

lib-src/libmp3lame/lameerror.h

@@ -0,0 +1,26 @@
+/*
+ *  A collection of LAME Error Codes
+ *
+ *  Please use the constants defined here instead of some arbitrary
+ *  values. Currently the values starting at -10 to avoid intersection
+ *  with the -1, -2, -3 and -4 used in the current code.
+ *
+ *  May be this should be a part of the include/lame.h.
+ */
+
+typedef enum {
+    LAME_OKAY = 0,
+    LAME_NOERROR = 0,
+    LAME_GENERICERROR = -1,
+    LAME_NOMEM = -10,
+    LAME_BADBITRATE = -11,
+    LAME_BADSAMPFREQ = -12,
+    LAME_INTERNALERROR = -13,
+
+    FRONTEND_READERROR = -80,
+    FRONTEND_WRITEERROR = -81,
+    FRONTEND_FILETOOLARGE = -82,
+
+} lame_errorcodes_t;
+
+/* end of lameerror.h */