bundle the display-related hints, that tell bot() and others

that an update is required, into a struct. Remove it from
context since there is no reason to save those.

include/context.h

@@ -159,8 +159,8 @@ struct context_info {
     boolean move;
     boolean mv;
     boolean bypasses;    /* bypass flag is set on at least one fobj */
-    boolean botl;        /* partially redo status line */
-    boolean botlx;       /* print an entirely new bottom line */
+    boolean placeholder1;
+    boolean placeholder2;
     boolean door_opened; /* set to true if door was opened during test_move */
     boolean tips[NUM_TIPS];
     struct dig_info digging;

include/decl.h

@@ -115,6 +115,13 @@ extern struct tc_gbl_data {   /* also declared in tcap.h */
 extern const char *ARGV0;
 #endif
 
+struct display_hints {
+    boolean botl;            /* partially redo status line */
+    boolean botlx;           /* print an entirely new bottom line */
+    boolean time_botl;       /* context.botl for 'time' (moves) only */
+};
+extern struct display_hints display;
+
 /*
  * 'gX' -- instance_globals holds engine state that does not need to be
  * persisted upon game exit.  The initialization state is well defined

include/flag.h

@@ -340,7 +340,6 @@ struct instance_flags {
 #endif
     boolean cmdassist;       /* provide detailed assistance for some comnds */
     boolean fireassist;      /* autowield launcher when using fire-command */
-    boolean time_botl;       /* context.botl for 'time' (moves) only */
     boolean wizweight;       /* display weight of everything in wizard mode */
     boolean wizmgender;      /* test gender info from core in window port */
     /*