part4: adapt codebase to changes in lib/

mostly straightforward except for CVSFile / Filesystem. moved the former
into the newly created latter component. removed VFSUtil entirely (that
functionality is available from lib/file/file_system_util.h)

Xeromyces.cpp: simplify buffer handling since smart pointers are now in
play. also use WriteBuffer instead of membuffer.

This was SVN commit r5519.

source/scripting/ScriptGlue.cpp

@@ -19,6 +19,7 @@
 #include "graphics/scripting/JSInterface_LightEnv.h"
 #include "gui/CGUI.h"
 #include "lib/timer.h"
+#include "lib/frequency_filter.h"
 #include "maths/scripting/JSInterface_Vector3D.h"
 #include "network/Client.h"
 #include "network/Server.h"
@@ -913,7 +914,8 @@ JSBool GetFps( JSContext* cx, JSObject*, uint argc, jsval* argv, jsval* rval )
 {
 	JSU_REQUIRE_NO_PARAMS();
 
-	*rval = INT_TO_JSVAL(fps);
+	extern PIFrequencyFilter g_frequencyFilter;
+	*rval = INT_TO_JSVAL(g_frequencyFilter->StableFrequency());
 	return JS_TRUE;
 }