app_server & libbe: Use server_read_only_memory for the colormap.

At present there's only ever one global one, so we don't bother using
an array for multiple screens (and we don't support multiple screens
yet anyway.)

This fixes a very old TODO, and avoids sending a ~32 KB port message
on every application startup.

Note that this breaks the app_server protocol ABI.

headers/private/app/ServerProtocol.h

@@ -162,7 +162,6 @@ enum {
 	AS_GET_PIXEL_CLOCK_LIMITS,
 	AS_GET_TIMING_CONSTRAINTS,
 
-	AS_SCREEN_GET_COLORMAP,
 	AS_GET_DESKTOP_COLOR,
 	AS_SET_DESKTOP_COLOR,
 	AS_GET_SCREEN_ID_FROM_WINDOW,
@@ -375,9 +374,6 @@ enum {
 	AS_VIEW_CLIP_TO_RECT,
 	AS_VIEW_CLIP_TO_SHAPE,
 
-	// Internal messages
-	AS_COLOR_MAP_UPDATED,
-
 	AS_LAST_CODE
 };
 

headers/private/app/ServerReadOnlyMemory.h

@@ -21,6 +21,7 @@ static const int32 kColorWhichCount = kColorWhichLastContinuous + 3;
 
 
 struct server_read_only_memory {
+	color_map	colormap;
 	rgb_color	colors[kColorWhichCount];
 };
 

headers/private/interface/PrivateScreen.h

@@ -107,10 +107,8 @@ private:
 private:
 			int32				fID;
 			int32				fReferenceCount;
-			color_map*			fColorMap;
 			sem_id				fRetraceSem;
 			bool				fRetraceSemValid;
-			bool				fOwnsColorMap;
 			BRect				fFrame;
 			bigtime_t			fLastUpdate;
 };