Enable  'AutomaticManagedPagefile' when destroying a pagefile and the
'self.instances' count is 0
Utilize 'self.flush'  in the 'create'  method.
If 'maximumsize' is not set it will inherit the value of 'initialsize' and vice versa.
Refactor some of the WMI interactions to use 'to_enum', 'find', etc.