feat(android): Added Ti.App "close" event support

[jquick-axway]

JIRA:
https://jira.appcelerator.org/browse/TIMOB-26542

Summary:

• Fires "close" event just before JS runtime terminates.
  • We document that this must be the last event. So, this is the perfect place to do it.
  • Had to modify V8Object and V8Function to allow V8 calls while in the "released" state.
• KrollRuntime was refactored a bit:
  • Removed RELAUNCH state. No longer needed since 8.0.0's intent refactoring and now that Services/BroadcastReceivers won't keep JS runtime alive anymore.
  • Removed CountDownLatch. No longer needed since JS runtime can only be ran from UI thread.
  • Modified V8Object and V8Function to allow V8 calls while KrollRuntime is in the RELEASED state, which happens when an OnDisposingListener is being invoked.
• Moved cancelTimers() call from KrollRuntime to TiApplication.
  • Doing this via listener is a better solution. No longer tightly coupled.

Note:
I've noticed that our TiApplication.softRestart() does not follow the rules and calls the V8Runtime's dispose/init methods directly. This means our OnDisposingListeners won't get invoked. The Ti.App._restart() handling still works with my PR (I've tested it), but we may want to look into this in the future.

Close Event Test:

1. Build and run the below code on Android.
2. Press the "Back" button.
3. Verify the following got logged: ### App 'close' event was fired.
4. Relaunch the app.
5. Repeat steps 2 and 3.

Ti.App.addEventListener("close", function() {
	Ti.API.info("### App 'close' event was fired.");
});
Ti.UI.createWindow().open();

LiveView Test:
This test verifies that our runtime restart changes work okay.

1. Build and run kitchensink-v2 via LiveView on Android.
2. Verify that the app launches okay.
3. Edit a JS file and click save.
4. Verify that the app re-launches okay.

[keerthi1032]

FR passed. Event fired when back button clicked and kitchen sink works fine with live view. build failed in jenkin. Waiting for CR .

Operating System
Name = Mac OS X
Version = 10.13.6
Architecture = 64bit
Node.js
Node.js Version = 8.12.0
npm Version = 6.4.1
Titanium CLI
CLI Version = 5.1.1
Studio Version=
CLI =7.0.10 master 10
Titanium SDK
SDK Version = local 8.1.sdk
Device =Samsung s5 android 6, Oneplus 5t android 9
Emulator =Pixel 3xl android 8

[build]

	Warnings
⚠️	Commit 8fc1dbbee99749dd8903a6902104db32f252d151 has a message "[TIMOB-26542] Android: Added Ti.App "close" event support Removed KrollRuntime state RELAUNCHED. No longer relevant. Removed KrollRuntime CountDownLatch. No longer needed since Kroll thread is not supported." giving 2 errors: subject may not be empty type may not be empty

	Messages
📖	👍 Hey!, You deleted more code than you added. That's awesome!
📖	💾 Here's the generated SDK zipfile.
📖	✅ All tests are passing Nice one! All 4336 tests are passing. (There are 471 tests skipped)
📖	🚨 This PR has one or more commits with warnings/errors for commit messages not matching our configuration. You may want to squash merge this PR and edit the message to match our conventions, or ask the original developer to modify their history.

Generated by 🚫 dangerJS against 5c2f3fe

[jquick-axway]

@garymathews, I'm going to push this PR out from 8.1.0 to 8.3.0 since it makes high risk changes to our kroll runtime.

[sgtcoolguy]

FR passed, but still needs a CR cc @garymathews @ypbnv

[garymathews]

CR: PASS