[ALOY-1714] Allow ~/ to be used as a shortcut for WPATH() in xml view attributes

[brentonhouse]

https://jira.appcelerator.org/browse/ALOY-1714

Allow ~/ be used as a shortcut for this so that WPATH() is no longer required when using with XML View attributes

<Alloy>
    <ImageView id="image" image="~/images/a.png" />
</Alloy>

[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 3490 tests are passing.

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[ewanharris]

I think we're going to faces the same challenges as #953 here, this currently will only work in views. If we're adding syntactic sugar like this I'd rather see it work in the majority of places rather than a single one