preparation for using DMAgic in the screen editor

src/kernal/screen_m65/mega65_chrout_screen_control_1.s

@@ -42,8 +42,6 @@ m65_chrout_screen_RETURN:
 	sta INSRT
 	sta RVS
 
-	// XXX should we clear special colour attributes too?
-
 	// Move cursor to the beginning of the next line
 
 	bit M65_SCRWINMODE

src/kernal/screen_m65/mega65_clrscr.s

@@ -31,6 +31,7 @@ m65_clrscr_takeover: // .A has to be 0
 	sta M65_TXTROW_OFF+1
 
 	// Clear the whole screen+color memory
+	// XXX consider using DMAgic for this - FILL command
 
 	phz
 

src/kernal/screen_m65/mega65_clrwin.s

@@ -3,6 +3,7 @@
 
 
 // XXX deduplicate pointer manipulation, see M65_CLRSCR
+// XXX consider using DMAgic for this - FILL command
 
 M65_CLRWIN: