Fix invalid WebIDL

[gkellogg]

From #135 –

The JSON-LD Framing API specification extends interfaces of the JSON-LD API but does not use the partial extension keyword, meaning that interfaces from both specs cannot be automatically merged into one.

The JSON-LD Framing API specification also re-defines interfaces that are already defined in the JSON-LD API for no apparent reason, which is bad practice as it creates two normative definitions of the same object.

This update makes the following changes to drop duplicate definitions and improve cross-reference links between the JSON-LD Framing API and the JSON-LD API:

• Dropped duplicate definition of JsonLd interface
• Defined JsonLdProcessor as partial (and dropped constructor member since it is already defined in the JSON-LD API)
• Dropped duplicate definitions of JsonLdRecord and JsonLdInput
• Defined JsonLdOptions as partial (and dropped ordered since it is already defined in the JSON-LD API)
• Replaced data-cite links with {{xx}} links where possible
• Dropped self-reference from xref ReSpec config array (useless, local definitions are always available)

cc/@tidoust

[gkellogg]

Summary: Updates the definitions of JsonLdProcessor and JsonLdOptions to be conform with WebIDL requirements.