Allow accessing site/application properties and the session in expressions

If the visibility of an action, datasource, field, linkpanel or link depends on an application or site property, developers currently can only perform these checks programmatically.

Thus, it would be an useful feature to be able to use those properties also in expressions.

Example:

<condition expression="${SITE.coolFeatureEnabled and APP.providesCoolFeature and SESSION.allowCoolFeature}>