Add the AppHasFocus lua binding.

Docs/Changelog_sm5.txt

@@ -12,6 +12,7 @@ StepMania 5.0 $next | 2011xxxx
 ----------
 * [ArrowEffects] Fix Expand, and possibly other mods, from breaking if
   using a second player. [Wolfman2000]
+* [ArchHooks] Add the AppHasFocus lua binding. [Wolfman2000]
 
 2011/10/29
 ----------

Docs/Luadoc/Lua.xml

@@ -535,6 +535,9 @@
 			<Function name='GetCurrentAnnouncer'/>
 			<Function name='SetCurrentAnnouncer'/>
 		</Class>
+		<Class name='ArchHooks'>
+			<Function name='AppHasFocus'/>
+		</Class>
 		<Class base='BitmapText' name='BPMDisplay'>
 			<Function name='GetText'/>
 			<Function name='SetFromCourse'/>

Docs/Luadoc/LuaDocumentation.xml

@@ -1364,6 +1364,11 @@
 		Sets the announcer to <code>sNewAnnouncer</code>.
 	</Function>
 </Class>
+<Class name='ArchHooks'>
+	<Function name='AppHasFocus' return='bool' arguments=''>
+		Returns <code>true</code> if the application presently has focus.
+	</Function>
+</Class>
 <Class name='Banner'>
 	<Function name='GetScrolling' return='bool' arguments=''>
 		Returns <code>true</code> if the Banner is currently scrolling.