[ALOY-1370] Alloy: Alloy/studio disregards variables that are not being used.

When a breakpoint gets hit, if at the end of that function you step-into, the next JS function will make the debugger stop. To reproduce:

Create an Alloy app

Copy the following code into index.js:

function doClick(e) {
    alert($.label.text);
    Ti.API.info("Testing Debug");
}

$.index.open();

function onInterval() {
	var a = 1;
	var b = 3;
	var c = a + b;
}

// call every 4 seconds;
setInterval(onInterval, 4000);

#Set a breakpoint at line 8 and try to step in too. Actual result: The debugger stops at the onInterval function Expected result The debugger should not stop at the onInterval function Studio removes any variables that are not being used like a b and c in the snippet above. Maybe we could disabled this when in debugging an app as oppose to running it. When debugging the users will most likely want to see un-used variables they are using strictly for testing purposes. If its not too much work , maybe we can consider this improvement/new feature. Thanks!