New functions and fixes in lexical introspection.

* evalc (macro_k): New keyword symbol variable.
(lexical_binding_kind, lexical_fun_binding_kind)
 New functions.
(lexical_var_p): Bugfix: if the symbol is a special
variable, do not short-circuit to a nil answer.
Special variables can be shadowed by symbol macros.
The function is now defined in terms of lexical_binding_kind.
(lexical_symacro_p, lexical_macro_p): New
functions.
(lexical_fun_p): Now defined using lexical_fun_binding_kind.
(lexical_lisp1_binding): Bugfix: check for special
variables; do not report special variables as :var.
(eval_init): Initialize macro_k. Register new intrinsics:
lexical-binding-kind, lexical-fun-binding-kind,
lexical-symacro-p, lexical-macro-p.

* txr.1: Documented.

* stdlib/doc-syms.tl: Updated.

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