disambiguate some syntax

optimize continuity proofs in fixrec package, using cont2cont rules

add beta_cfun simproc, which uses cont2cont rules

removed fixrec_simp attribute (cf. a2a1c8a658ef)

simplify definition of eta_tac

remove fixrec_simp attribute; fixrec uses default simpset from theory context instead

remove cont2cont simproc; instead declare cont2cont rules as simp rules

domain package internal proofs use fixed set of continuity rules, rather than taking cont2cont rules from context

merged

modernized sorting algorithms; quicksort implements sort

modernized sorting algorithms; quicksort implements sort

localized properties_for_sort

@tailrec annotation;

renamed "rev" to "reverse" following usual Scala conventions;

parse_spans: cover full range including adjacent well-formed commands -- intermediate ignored and malformed commands are reparsed as well;

added rev_iterator;

tuned;

access statically typed dockable windows;

simplified dockables using class Dockable;

generic dockable window;

separate event bus and dockable for raw output (stdout);

more Mac OS problems;

ignore system messages;

use proper ISABELLE_PLATFORM instead of adhoc uname;

refrain from using bold within the term language -- looks odd in Lobo with error/warning background;

tuned;

removed timing;

rendering information and style sheets via settings; generalized Isabelle_System.try_read; prefer getenv_strict in most situations;

more brackets -- unaligned to prevent odd auto-indentation;

merged