Provide function for escaping text in APL templates
According to the docs, APL Text items support some HTML-like markup, with a custom escape method for special characters:
There should be a function in the SDKs that we can use for escaping a plain text string, to display it as-is.
Also, the chart under "Markup characters in text must be replaced with character entity references" is a little confusing. E.g. what are we supposed to replace &, <, and > with?