Adding some test cases for the pre-processor. (Total hack, requires copying and pasting code from the actual app source into another file and running a shell script, but it's better than nothing.)

app/preproc/test/data/foo2.cpp

@@ -0,0 +1,8 @@
+void playMessage(prog_uchar* message){
+  
+maxStringSize =  sizeof(message);  // find message size
+}
+
+void loop() {
+  playMessage(signMessage);
+}