Provide compile checking for translations

This is a bit of a brain dump. I might tidy it up later.

The tr() function from Roku provides i18n functionality.

We should do the following:

• add auto-completes for available strings in the translation files whenever you type tr()
• parse all of the translation files
• add a warning for any tr() call referencing a source that is not available in at least 1 localization file
• add a warning for any <Label text="" /> tag that references a source
• add a compiler option strictLocalization which does the stuff above.

We should be able to look it up in the file.

There are two ways this is handled
In the xml:

<Label id=“myLabel” text=“hello world” />

Roku will automatically replace "hello world" with the localized value IF there is a

Provide autocomplete for them.

Related information:
https://developer.roku.com/docs/developer-program/core-concepts/localization.md
https://developer.roku.com/docs/references/brightscript/language/global-utility-functions.md#trsource-as-string-as-string