Add support to set object properties via XML

[brentonhouse]

PR for https://jira.appcelerator.org/browse/ALOY-1363

[FokkeZB]

Great work! I guess we need a test app added @feons ?

[feons]

Yup! Please include a test app for this PR. Thank you!

[brentonhouse]

I haven't done one of the test apps for Alloy before but I will take a look at what it takes to create one. Thanks!

[feons]

@brentonhouse, to get started you can use this command in your Alloy repo node tools/create_test.js ALOY-### where ALOY-### is the ticket number. That'll create a folder under test/apps/testing/ALOY-###, you can fill in code necessary to test the PR.

[FokkeZB]

Then use run the test to verify it works and run generate and verify the generated code is as it should be. Submit including the generated code and done.

man.. we need to document this better

[brentonhouse]

Added test app: https://github.com/brentonhouse/brentonhouse.alloy/tree/feature-xml-attribute-prefix/test/apps/testing/ALOY-1363

[skypanther]

@FokkeZB the create_test.js file is minimally documented at https://github.com/appcelerator/alloy/tree/master/tools and I think I had added stuff to our internal wiki about it. But, I agree that it should be better documented for contributors.

[hansemannn]

@feons @brentonhouse This should go into 2.0.0, can we schedule this?

[hansemannn]

@feons Please review. This can even go pre 2.0.0 since I do not see a breaking change here.

[hansemannn]

@ewanharris @brentonhouse Ping! Can this please be reviewed? Highly demanded feature.

[ewanharris]

Similar to #765, I think it'd be best to do this in the initial pass in getParserArgs. Before we set the the attribute on createArgs here, we could maybe check if it's a dotted property and then split the property and key name to be set on createArgs?

[build]

	Warnings
⚠️	Please ensure to add a changelog entry for your changes. Edit the CHANGELOG.md file and add your change under the Unreleased items header

	Messages
📖	✅ All tests are passing Nice one! All 3480 tests are passing.

Generated by 🚫 dangerJS against 33e9410

[ewanharris]

The changes look good to me!

Merging