GRAILS-11296: When page removed from pageCache, clear metaClass

When GroovyPageMetaInfo is removed from the pageCache, remove the metaclass from the pageClass in the GroovyPageMetaInfo.
GRAILS-10723 add defaults for current controller and action in GroovyPageUnitTestMixin tests
fix incorrect javadoc comment
GRAILS-11322 add HTML escaping to remoteField and remoteLink tags
GRAILS-11317 wrap remoteFunction, remoteLink and remoteField with raw by default so that they can be used with function call syntax in GSP expressions
GRAILS-11323 Fallback for autowire properties optimization