Add a section to the Haiku Book with a very special topic, the keyboard.

This started off as just being a page to detail the key codes since I find
myself constantly referencing the BeBook page on the subject and it is
horribly broken. However, the page has grown to detail many of the keyboard
related methods and constants defined in InterfaceDefs.h as well. A very
long and detailed explanation of the key_map structure is included.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@43230 a95241bf-73f2-0310-859d-f6bbb57e9c96

docs/user/book.dox

@@ -54,6 +54,7 @@
 	\section special_topics Special Topics
 
 	- \ref drivers
+	- \ref keyboard
 */
 
 ///// Define main kits /////
@@ -96,9 +97,6 @@
 		- BRoster
 
 
-	\defgroup drivers Device Drivers
-
-
 	\defgroup interface Interface Kit
 	\brief API for displaying a graphical user interface.
 
@@ -553,3 +551,9 @@ snooze_until(time - Latency(), B_SYSTEM_TIMEBASE);
 	\defgroup layout Layout classes in the Interface Kit
 	\ingroup interface
 */
+
+
+///// Special Topics /////
+
+\defgroup drivers Device Drivers
+\defgroup keyboard Keyboard