CHANGE_COLOR palette option adjustments

It was too early to call the windowport change_color() routine
while processing the config file. The windowport was not yet
fully operational.

Now the palette option processing will just place the rgb
value into the appropriate ga.altpalette[CLR_MAX] entry.

init_sound_disp_gamewindows(void) [allmain.c] calls
change_palette() [coloratt.c] and it will call the windowport
change_color() function for each ga.altpalette[] entry that
has been set.

Notes:
The rgb values stored in ga.altpalette[] have the NH_ALTPALETTE bit set
so that the rgb value of 0 can be stored and be distinguishable from
a "not set" entry.

The NH_ALTPALETTE bit is cleared from the rgb value in change_palette()
prior to calling the windowport change_color() function.

The syntax for palette is colorname/r-g-b.
For example: palette:black/12-12-12

colorname must be one of the NH_BASIC_COLOR names or a suitable
alias for one of those 16 entries.

Some of the windowport CHANGE_COLOR functions had the wrong parameters,
perhaps due to bitrot. Those have been corrected to match the prototype.

include/decl.h

@@ -157,6 +157,11 @@ struct instance_globals_a {
     short *animal_list; /* list of PM values for animal monsters */
     int animal_list_count;
 
+#ifdef CHANGE_COLOR
+    /* options.c */
+    uint32 altpalette[CLR_MAX];
+#endif
+
     /* pickup.c */
     int A_first_hint; /* menustyle:Full plus 'A' response + !paranoid:A */
     int A_second_hint; /* menustyle:Full plus 'A' response + paranoid:A */
@@ -759,6 +764,7 @@ struct instance_globals_o {
     boolean opt_need_promptstyle;
     boolean opt_reset_customcolors;
     boolean opt_reset_customsymbols;
+    boolean opt_update_basic_palette;
 
     /* pickup.c */
     int oldcap; /* last encumbrance */