0.86.3 – Wasm it up

Changes:

• The XmlStreaming object in core is replaced by an interface IXmlStreaming
  with an accessor function xmlStreaming that provides an appropriate
  instance. The platform specific objects have been retained, but deprecated.
  In various places extension functions have been added.
• The KTOR module has been dropped from this release. As ktor officially supports
  the XML serialization using this library, please use the official ktor module.

Features:

• Update to kotlinx.serialization 1.6.1, add wasmJs/wasmWasi support.
• Support strict boolean parsing in policy
  (using xml schema rules allowing: 1, true, 0, false)
• Add an alias XmlBoolean that parses according to xml rules independent of
  the policy.
• Add versioned recommended configuration of the serializer. This provides
  for a stable configuration without manual configuration.
• Add support for purely text lists as text content (similar to attributes).
  This comes with a textListDelimiters policy function that allows
  specifying delimiters (note that it will apply xml schema compatible
  collapsing of whitespace - as articles do).

Fixes:

• Fix handling of empty textual value content.
• Fix collapsing whitespace when it is empty #180.
• Fix the way the recommended config works to apply the policy. Note that
  recommended is not designed to be stable.
• Fix regression on root tag strictness. Now if the root type has a declared @XmlSerialName
  this type will be expected as the root tag unless explicitly specified differently
  as parameter.
• Add a proper non-deprecated constructor for DefaultXmlSerializationPolicy
  this takes a Builder, or a configuration lambda. Both options enable
  future proofing when further attributes are added.
• In the platform independent (native) DOM implementation allow
  comments outside the document element (rather than throwing an exception).
  Fixes #189.