Improvement

The following features were added:

• References' names suggestions.
• Conditional properties's suggestions.

To enable the extension to provide completions for references and conditional properties, you need to create the corresponding HTML comments in any area of the target document:

<!--ref = reference1 reference2-->
<!--conditional = conditional conditional-->

You should replace the placeholders 'reference1' and 'reference2' with the actual references' names used in the document, and do the same for the conditional properties.

ref and conditional are identifiers, the former is used for declaring the references' names, while the latter is used for declaring conditional properties' names.