Improve the comments associated with properties to work better with
Blueprint's auto-documenting feature.
Make all properties structs into named types so that thet types can be
found using reflection and cross-referenced to the source code to
auto-extract docs.
Remove the leading <property>: text from properties, the documentation
will include the lowercased name of the property.
Add filter tags to the nested arch properties.
Change-Id: I4ef5db86358886fe61456c24eb2dbe6f7b876115
7d5136f033