Deprecate Info.plist values in favor of `extra_plist_info`

`extra_plist_info` has been introduced in #415 to allow for arbitrary values in the `Info.plist` file. This was done in part because implementing all possible properties into the `menuinst` schema doesn't scale. The majority of values can now be deprecated in favor of `extra_plist_info`. Only the values that `menuinst` needs should remain as a top-level keyword.