v0.8.0

Changed

• Modern is the default language mode everywhere: new PrologEngine(), new BytecodeProgram(),
  dotnet prolog run and lint, the DotPrologLanguageMode project default, and generated entry
  points, test hosts, and facades. Double-quoted text therefore reads as a list of one-character
  atoms unless a project says otherwise — "abc" = [L|Ls] gives L = a, Ls = [b,c]. ISO/IEC
  13211-1 leaves the initial value implementation defined, so chars is a conforming default,
  and it is the one Scryer, Trealla, ichiban, Flowlog, and Trilog use. StrictIso still starts
  at codes.
• The ISO conformance case for the initial double_quotes value now checks that it lies in the
  flag's ISO domain rather than pinning codes, since the standard leaves the value to the
  processor.

Removed

• The Extended language mode. It differed from Modern only in starting double_quotes at
  codes, which the double_quotes=codes flag override already expresses. --mode extended and
  <DotPrologLanguageMode>extended are now rejected as unknown mode names, and
  PrologLanguageMode.Extended no longer exists; PrologLanguageMode.Modern is now the enum's
  first value. dotnet prolog and dotnet prolog lint list modern|strict-iso.

Compatibility

• A program that relied on the unstated codes default reads double-quoted text differently.
  Mixing the two conventions can fail silently in grammars — a terminal written as "abc" no
  longer matches code input — or raise type errors, as in number_codes(N, "42"). Restore the
  old reading for a whole project with <DotPrologFlags>double_quotes=codes</DotPrologFlags> or
  dotnet prolog run --flag double_quotes=codes, for one file with
  :- set_prolog_flag(double_quotes, codes)., or for an embedding host with
  new PrologFlagOverrides { DoubleQuotes = DoubleQuotesMode.Codes }. A project or host that
  named extended replaces it with that override.