Added composite stuff (alpha stage, of course).

A lot of things are pending for implementation like region translucency, shadows, fading...
Per window translucency is in, but now working as expected.

evoke/EvokeService.h

@@ -15,6 +15,7 @@
 
 #include "Log.h"
 #include "Xsm.h"
+#include "Composite.h"
 
 #include <edelib/List.h>
 #include <edelib/String.h>
@@ -57,6 +58,7 @@ class EvokeService {
 		bool  is_running;
 		Log*  logfile;
 		Xsm*  xsm;
+		Composite* composite;
 		char* pidfile;
 		char* lockfile;
 
@@ -87,6 +89,8 @@ class EvokeService {
 		void init_xsettings_manager(void);
 		void stop_xsettings_manager(bool serialize);
 
+		void init_composite(void);
+
 		int handle(const XEvent* ev);
 
 		Log* log(void) { return logfile; }