ole32: Add a test that shows CoFreeUnusedLibraries only frees unused libraries from the current apartment.

ole32: Move the handling of loading a dll and getting an in-process object from it to an apartment-specific function.

Use it to implement apartment_hostobject in a cleaner way so that it is 
guaranteed to not recurse.

Store the library name and make it reference counted.

    
File handles are signaled when an I/O operation completes, and reset
when another operation is queued.

Get rid of a few WaitForMultipleObjectsEx hacks.

Do not attempt to draw a page during WM_PAINT if there is no active page.

And clean up when disconnecting input.

Also removes dead code caused by the change.

The handle will be closed by free_custom_action_data, so duplicate the 
handle before calling it.

shell32/tests: On Windows 98 FindExecutable() does not '\0' terminate the returned command which caused many tests to fail.