A lot more rebranding

plugins/sysinfo/sysinfo.cpp

@@ -25,7 +25,7 @@
 #include <comutil.h>
 #include <wbemidl.h>
 
-#include "xchat-plugin.h"
+#include "hexchat-plugin.h"
 
 static xchat_plugin *ph;   /* plugin handle */
 static char name[] = "SysInfo";

plugins/sysinfo/xsys.c

@@ -28,7 +28,7 @@
 #include <string.h>
 #include <glib.h>
 
-#include "xchat-plugin.h"
+#include "hexchat-plugin.h"
 #include "parse.h"
 #include "match.h"
 #include "xsys.h"