bigly changes (see description)

- use LdrRegisterDllNotification instead of LoadLibraryExW for patching
** LoadLibraryExW is currently still hooked for the UpdatePack7 compatibility fix, I'm looking into other alternatives
- more robust error checking
- refactored a lot of code to be more reusable
- header guards
- better logging framework
- tighter permissions on the unload event
- probably other stuff I forgot about

wufuc_aihelper/aihelper.c

@@ -2,9 +2,10 @@
 #include <Msiquery.h>
 #include <tchar.h>
 
+__declspec(dllexport)
 UINT __stdcall AIHelper_SetUnloadEvent(MSIHANDLE hInstall) {
     HANDLE hEvent = OpenEvent(EVENT_MODIFY_STATE, FALSE, _T("Global\\wufuc_UnloadEvent"));
-    if (hEvent) {
+    if ( hEvent ) {
         SetEvent(hEvent);
         CloseHandle(hEvent);
     }