Improve undefined map assembler messages (#2196)

asm/macros/event.inc

@@ -667,6 +667,14 @@
 	map \map
 	.endm
 
+	@ Set the player object's invisibility to FALSE.
+	.macro showplayer
+	.byte SCR_OP_SHOWOBJECTAT
+	.2byte LOCALID_PLAYER
+	.byte 0 @ map group
+	.byte 0 @ map num
+	.endm
+
 	@ Sets the specified object's invisibility to TRUE.
 	.macro hideobjectat localId:req, map:req
 	.byte SCR_OP_HIDEOBJECTAT
@@ -674,6 +682,14 @@
 	map \map
 	.endm
 
+	@ Set the player object's invisibility to TRUE.
+	.macro hideplayer
+	.byte SCR_OP_HIDEOBJECTAT
+	.2byte LOCALID_PLAYER
+	.byte 0 @ map group
+	.byte 0 @ map num
+	.endm
+
 	@ Turns the currently selected object (if there is one) to face the player.
 	.macro faceplayer
 	.byte SCR_OP_FACEPLAYER