feat(ios): support circular require references

[sgtcoolguy]

JIRA: https://jira.appcelerator.org/browse/TIMOB-27888

Description:
This is a PR to unify our require implementation between iOS and Android. Android had a mostly JS-based implementation based off Node.js. The native layer uses bindings for native/core modules and loading those. But the bulk of loading JS code is actually done in JS. On iOS, the entire flow was native.

This PR has been carefully rebased into meaningful commits to help Code Reviews (look at the individual commits, the full PR is overwhelming!).

The commits generally go as follows:

• Copy the Node.js require implementation into common and hijack iOS require to be replaced by it during ti.main.js load (and then add a test to verify it fixes the circular require issue in an app)
• Rip out the native implementation of require on iOS and do a refactoring of the code to make the underlying bindings cleaner.
• Create a new separate bundle in common for ti.kernel.js - equivalent to Android's kroll.js. This consists of the very core kernel JS scripts to set up the JS environment before ti.main.js is loaded.
• Refactor iOS startup to more closely match Android by executing ti.kernel.js bootstrap function - the most important/relevant thing it defines is Module - the class that does require. Then when we're asked to run ti.main.js or a service entry point, we run it though Module.runModule().
• Then refactor Android to use the common/ti.kernel.js in place of it's old kroll.js. The extensions to titanium APIs are moved out into the common/ti.internal/extensions/ti folder to occur during ti.main.js.

[build]

	Warnings
⚠️	android/titanium/libv8-services.js#L54 - android/titanium/libv8-services.js line 54 – 'debugGenerateSnapshot' is defined but never used. (no-unused-vars)

	Messages
📖	👍 Hey!, You deleted more code than you added. That's awesome!
📖	💾 Here's the generated SDK zipfile.
📖	✊ The commits in this PR match our conventions! Feel free to Rebase and Merge this PR when ready.
📖	✅ All tests are passing Nice one! All 13960 tests are passing. (There are 899 skipped tests not included in that total)

Generated by 🚫 dangerJS against 1d69030

[sgtcoolguy]

For some reason, this PR appears to make it so we cannot permanently alter Ti.Blob's prototype from JS to add the arrayBuffer method. I was able to implement the method natively after cherry-picking the Promise implementation from #10554 and defining arrayBuffer in Obj-C.

See:

• d92f05d
• 7c6c9d3

[vijaysingh-axway]

@sgtcoolguy While running the PR using Xcode, I am getting following error -
`Titanium[33147:305062] [ERROR] /ti.kernel.js:1214
fileIndex = JSON.parse(json);
^
SyntaxError: JSON Parse error: Unexpected identifier "undefined"
at parse ([native code])
at filenameExists (/ti.kernel.js:1214:32)
at loadAsFile (/ti.kernel.js:1085:31)
at loadAsFileOrDirectory (/ti.kernel.js:1017:36)
at require (/ti.kernel.js:828:49)
at Object. (file:///ti.main.js:14814:10)
at loadAsync (file:///ti.main.js:14760:13)
at Object. (file:///ti.main.js:14811:10)
at load (/ti.kernel.js:708:23)
at runModule (/ti.kernel.js:1258:17)

Foundation 0x0000000104dfeef0 _NSDescriptionWithLocaleFunc + 93
CoreFoundation 0x000000010adb489c __CFStringAppendFormatCore + 11852` 

[vijaysingh-axway]

@sgtcoolguy While running the PR using Xcode, I am getting following error -
`Titanium[33147:305062] [ERROR] /ti.kernel.js:1214
fileIndex = JSON.parse(json);
^
SyntaxError: JSON Parse error: Unexpected identifier "undefined"
at parse ([native code])
at filenameExists (/ti.kernel.js:1214:32)
at loadAsFile (/ti.kernel.js:1085:31)
at loadAsFileOrDirectory (/ti.kernel.js:1017:36)
at require (/ti.kernel.js:828:49)
at Object. (file:///ti.main.js:14814:10)
at loadAsync (file:///ti.main.js:14760:13)
at Object. (file:///ti.main.js:14811:10)
at load (/ti.kernel.js:708:23)
at runModule (/ti.kernel.js:1258:17)

Foundation 0x0000000104dfeef0 _NSDescriptionWithLocaleFunc + 93
CoreFoundation 0x000000010adb489c __CFStringAppendFormatCore + 11852` 

After new commits, it is working fine. Thanks!