- added multiple message levels for 'developer' CVAR so that the important stuff won't get drowned in pointless notification spam that's of no use to anyone.

- made 'developer' CVAR persist across launches and added some menu entries for it.
- added checks for 'developer' to ACS's CheckInventory function.

src/c_console.cpp

@@ -612,12 +612,12 @@ int Printf (const char *format, ...)
 	return count;
 }
 
-int DPrintf (const char *format, ...)
+int DPrintf (int level, const char *format, ...)
 {
 	va_list argptr;
 	int count;
 
-	if (developer)
+	if (developer >= level)
 	{
 		va_start (argptr, format);
 		count = VPrintf (PRINT_HIGH, format, argptr);