address issue #1065 - Auto-select every item

Issue most recently reported by Xdminsy (previously reported by
others):  it is too easy to accidentally pick choice 'A' in object
class selection menus for menustyle:Full.  Previous change relevant
to this was to exclude choices 'A' and 'a' from being set by '.'
(choose all entries) and '~' (toggle all entries).  That was an
improvement but doesn't help with pressing shift when meaning to
type 'a' by those who type faster than they cogitate.

This implements a suggestion by janne-hmp:  add new choice for the
paranoid_confirmation option, 'Autoall' (synonym 'Autoselect-all').
If the player sets this and includes 'A' among the choices for
class selection, prompt to confirm whether to honor it.  Like
confirmation for praying, it adds an extra y/n prompt rather than
change an existing y/n prompt into a yes/n or yes/no one.  If the
player declines, then nothing is selected and the operation is
cancelled rather than putting the menu back up to choose again.

OPTIONS=paranoid_confirm:autoall requires at least two letters
('au') even if the 'a' is capitalized.  paranoid_confirm:a means
confirm attacking peaceful monsters.  And it should be
OPTIONS=paranoid_confirm:autoall pray swim
if someone just wants to add autoall to the default paranoid bits.

The Guidebook hasn't been updated to describe the new choice since
it seems likely that it might undergo adjustments.

Closes #1065

include/flag.h

@@ -85,6 +85,7 @@ struct flag {
 #define PARANOID_WERECHANGE 0x0100
 #define PARANOID_EATING     0x0200
 #define PARANOID_SWIM       0x0400
+#define PARANOID_AUTOALL    0x0800
     int pickup_burden; /* maximum burden before prompt */
     int pile_limit;    /* controls feedback when walking over objects */
     char discosort;    /* order of dodiscovery/doclassdisco output: o,s,c,a */
@@ -481,6 +482,8 @@ enum runmode_types {
 #define ParanoidEating ((flags.paranoia_bits & PARANOID_EATING) != 0)
 /* Prevent going into lava or water without explicitly forcing it */
 #define ParanoidSwim ((flags.paranoia_bits & PARANOID_SWIM) != 0)
+/* Require confirmation for choosing 'A' in class menu for menustyle:Full */
+#define ParanoidAutoAll ((flags.paranoia_bits & PARANOID_AUTOALL) != 0U)
 
 /* command parsing, mainly dealing with number_pad handling;
    not saved and restored */