Issue 1672 - Subscribe and listen COM events using ATL::IDispEventImpl and BEGIN_SINK_MAP

src/plugin/AdblockPlus.idl

 // AdBlockPlus.idl : IDL source for AdblockPlus.dll
 //
 
 #include "AdblockPlusGuids.h"
 
 import "oaidl.idl";
 import "ocidl.idl";
 
 [
-        object,
-        uuid(GUUID_IPRODUCT),
-        dual,
-        helpstring("Adblock Plus Interface"),
-        pointer_default(unique)
-]
-interface IIEPlugin : IDispatch
-{
-};
-
-[
         uuid(GUUID_TYPELIB),
         version(1.0),
         helpstring("Adblock Plus 1.0 Type Library")
 ]
-
 library PluginLib
 {
         importlib("stdole32.tlb");
         importlib("stdole2.tlb");
 
         [
                 uuid(GUUID_CLASS_PRODUCT),
                 helpstring("Adblock Plus Class")
         ]
         coclass PluginClass
         {
-                [default] interface IIEPlugin;
+                [default] interface IUnknown;
         };
 };