(verilog-type-font-keywords): Add leda and 0in

(verilog-type-font-keywords): Add leda and 0in
as pragma keywords.
(verilog-pretty-expr): Support lining up assignments which include
part selects.
(verilog-mode): More portable check for the availability of
hideshow support.
(verilog-do-indent): Remove special indent for declarations inside
a parenthetical list.  The code is ill-advised, and doesn't work
given the new user defined types.
(verilog-set-auto-endcomments): Enhance function automatic
endcomment to support functions that return user defined types.
(verilog-mode): Add code to tell which-function-mode minor mode
that Verilog supports this feature.