[TIMOB-17821] Android: Add Support for Custom View to ActionBar

[ypbnv]

JIRA: https://jira.appcelerator.org/browse/TIMOB-17821

Description:
Expose setCustomView method for ActionBar.
We can add support in Alloy for that, but it would require some changes there as well.

Test cases:

With default action bar.

var window = Ti.UI.createWindow({title: 'Title', backgroundColor: 'gray'});
var customView = Ti.UI.createView({layout: 'horizontal'});
var button1 = Ti.UI.createButton({title: 'Button1'});
var button2 = Ti.UI.createButton({title: 'Button2'});
var picker = Ti.UI.createPicker({});
var slider = Ti.UI.createSlider({width: '30%', backgroundColor: 'teal'});
var data = [];

data[0]=Ti.UI.createPickerRow({title:'Row 1'});
data[1]=Ti.UI.createPickerRow({title:'Row 2'});
data[2]=Ti.UI.createPickerRow({title:'Row 3'});
picker.add(data);

customView.add(button1);
customView.add(slider);
customView.add(picker);

button2.addEventListener('click', function(){
    window.activity.actionBar.customView = customView;
});

window.add(button2);
window.open();

With Toolbar used as ActionBar.
Note that you need to use a theme with disabled ActionBar (eg. Theme.Titanium)

var window = Ti.UI.createWindow({title: 'Title', backgroundColor: 'gray'});
var customView = Ti.UI.createView({layout: 'horizontal'});
var button1 = Ti.UI.createButton({title: 'Button1'});
var button2 = Ti.UI.createButton({title: 'Button2'});
var picker = Ti.UI.createPicker({});
var slider = Ti.UI.createSlider({width: '30%', backgroundColor: 'teal'});
var toolbar = Ti.UI.createToolbar({top:0, barColor: '#222222', width: Ti.UI.FILL});
var data = [];

data[0]=Ti.UI.createPickerRow({title:'Row 1'});
data[1]=Ti.UI.createPickerRow({title:'Row 2'});
data[2]=Ti.UI.createPickerRow({title:'Row 3'});
picker.add(data);

customView.add(button1);
customView.add(slider);
customView.add(picker);

window.activity.supportToolbar = toolbar;

button2.addEventListener('click', function(){
    window.activity.actionBar.customView = customView;
});

window.add(toolbar);
window.add(button2);
window.open();

Preview:

[build]

	Messages
📖	💾 Here's the generated SDK zipfile.

Generated by 🚫 dangerJS

[lokeshchdhry]

FR Passed.

customView for actionBar works as expected in both the cases.

Studio Ver: 5.0.0.201712081732
SDK Ver: 7.2.0 local build
OS Ver: 10.13.2
Xcode Ver: Xcode 9.2
Appc NPM: 4.2.12
Appc CLI: 7.0.2
Daemon Ver: 1.0.1
Ti CLI Ver: 5.0.14
Alloy Ver: 1.11.0
Node Ver: 8.9.1
NPM Ver: 5.5.1
Java Ver: 1.8.0_101
Devices: ⇨ google Nexus 5 --- Android 6.0.1
⇨ google Nexus 6P --- Android 8.0.0
Emulator: Android 4.2.2