[TIMOB-5810] Android: maxLength propery on TextField and TextArea

TextField and TextArea needs a property to control the max length of the input text. Though this can be done using an eventlistener and a length check. It would be very useful if this was built-in.

var win = Ti.UI.createWindow();

var txt = Ti.UI.createTextField({
    top: 150,
	height: 100,
    backgroundColor: "white"
});

/* var txt = Ti.UI.createTextArea({
    top: 150,
    height: 100,
    backgroundColor: "white" */

var button = Ti.UI.createButton( {
    title: "set max length to 10"
});

button.addEventListener('click', function(e) {
   txt.maxLength = 10;
});
Ti.API.info("maxLength: " + txt.maxLength);
win.add(txt);
win.add(button);
win.open();

1. Run code 2. Check log, make sure maxLength is -1 3. Click on button 4. Start typing, the content should not exceed 10 characters. 5. Re-run code, this time enter 20+ characters before click on button 6. Click on button, text now should truncate to 10 characters 7. Repeat 1-6 on textArea.