Many private and even public properties and class constants were
documented using #-style comments, which were not available in Doxygen
documentation and editor tooling. Move these comments to PHPDoc comments
to make them accessible.
Add type declarations to private and internal properties wherever
possible. Remove PHPDoc documentation made redundant by this, but
add/keep PHPDoc documentation where it provides additional value
(human-readable documentation, array types, union types). Don’t add type
declarations to non-internal public properties as it potentially causes
breakage in case some external code not only uses the deprecated
property, but even writes it. These type declarations should be added
when the properties are made private or internal.
Change-Id: I247643b9bf0cabdc92a7e893d653edeaed9a1307
6cf91bbb4c