More better perl module organization; keep utility modules in Moz. Also read list of modules to checkout from a file. NOT PART OF THE BUILD

build/mac/build_scripts/PullMozilla.pl

@@ -26,7 +26,7 @@
 #
 
 use Cwd;
-use MozillaBuildCore;
+use Moz::BuildCore;
 
 #-----------------------------------------------
 # hashes to hold build options