MXS-1300: Make MaxCtrl more like a library

All invocations into the common helper functions are now done through the
`maxctrl` function. This allows the program arguments to be passed to the
core as a parameter instead of reading them from global variables.

This helps with the implicit initialization that was done when the yargs
library was required which caused duplicated output.

Refactored the core functions so that they only process the argument
vector. The parsing of the argument vector is done in maxctrl.js where it
is more appropriate.

maxctrl/maxctrl.js

@@ -13,4 +13,18 @@
 
 'use strict';
 
-require('./core.js')(process.argv)
+var argv = process.argv
+
+// Mangle the arguments if we are being called from the command line
+if (argv[0] == process.execPath) {
+    argv.shift()
+    // The first argument is always the script
+    argv.shift()
+}
+
+require('./core.js')(argv)
+    .then(function(output){
+        if (output.length > 0) {
+            console.log(output)
+        }
+    }, console.log)