tty: count for group accelerators

github issue #697 from copperwater points out that using a menu for
pickup and attempting to give a count to pickup a subset of gold was
ignoring the count and picking up all gold.  That was an unintended
side-effect of making '$' be a group accelerator for gold in addition
to being the 'letter' for a stack of gold (so that it can be chosen
even when not displayed on the current page, the way other groups
behave).

Picking groups via their accelerator ignored any pending count (in
tty; curses seems to apply the count).  Change tty to apply a pending
count to all menu entries that get toggled on via group accelerator.
It's intended to address the gold bug but might also be used to
select one from every potion stack via '1!', for example.  (Seems to
be of very limited functionality, but that was more straightforward
than singling out gold's group to behave differently.)

While in there, change how tty uses menuitem_invert_test():  call it
for set-page/set-all/unset-page/unset-all in addition to existing
invert-page/invert-all.  unset-page/unset-all won't actually be
affected unless 'menuinvertmode' option is set to 2.

Closes #697

doc/fixes3-7-0.txt

@@ -1084,6 +1084,7 @@ counting "just picked up" items when deciding what pseudo-classes should be
 changes to stair internals resulted in summoned Kops blockcading the stairs up
 	rather than intended stairs down
 dumplog's list of "major events" showed all logged events, not just major ones
+pickup via menu ignored player-specified count when picking up gold
 
 curses: 'msg_window' option wasn't functional for curses unless the binary
 	also included tty support