[SHLEXTDBG] Added IQueryAssociations, SHGetFileInfo and ShellExecute actions (#6030)

[SHLEXTDBG] Added IQueryAssociations, SHGetFileInfo and ShellExecute actions (#6030)

Added multiple new actions, most of them will use the system default implementation but can be forced to use a specific CLSID or IShellFolder implementation.

-  /shgfi (SHGetFileInfo)
-  /assocq (IQueryAssociations)
-  /shellexec (ShellExecuteEx on pidl)
-  /dumpmenu (Dumps the HMENU of a IContextMenu with its menu ids and verbs)

Added /explorerinstance as a new wait mode and made it the default. All the other wait modes are hacks that just works around bugs in ROS.