jsonkit.1.1.0

• Fix the of_json deriver for polymorphic variants with inherited rows, on
  both backends. Decoding now tries, in this order: the type's own tags, then
  the inherited types (in definition order), then the [@json.catch_all] row,
  then the error (or [@json.allow_any]). It no longer depends on the row
  order in the definition: an inherited type listed before an own tag used to
  shadow it on Melange, and an own catch-all used to swallow every tag of the
  inherited types on both backends.
• Fix: use the len value as an expression on the variant case function to avoid
  expected "named" value to be declared on the function.
• Fix: remove the duplicated runtime deps from the ppx libraries.
• Move the JSON Schema runtime into the main packages, at Jsonkit.Jsonschema.
  It is the same API under a new path, on both backends, so sources shared
  between a native and a Melange build need no per-backend conditionals. The
  JSON runtime is unchanged and stays where it is: everything previously at
  Jsonkit.* is still at Jsonkit.*, and is now also reachable as
  Jsonkit.Json.*.
• Deprecate the jsonkit.jsonschema and
  jsonkit-melange.jsonschema libraries, along with the
  Ppx_deriving_jsonschema_runtime, Ppx_deriving_jsonschema_runtime_classify
  and Ppx_deriving_jsonschema_runtime_primitives modules. They still exist and
  still work, as aliases for Jsonkit.Jsonschema, Jsonkit.Jsonschema.Classify
  and the primitives modules. The deprecated modules keep their old shape:
  Primitives still has its Yojson and Jsonkit submodules, and
  json_schema is still there under that name, so existing code compiles
  unchanged.