Refactored Block Attributes element processing inside lists.
Added new 'Continuation' Delimited Block.
Disallow Attribute Block elements immediately following list items (to much potential ambiguity).
Drop 'Continuation' Delimited Block experiment for now.
Tighten up type declarations with --noImplicityAny TypeScript compiler option.
Refactor inherited ExpansionOptions to composition properties (definitions are not an ExpansionOptions, they contain ExpansionOptions.
Minor documentation updates.