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Provide a reference to the previous instance in case of events

When retrieving instance events, the old WMI library provides the
previous instance state as well, when available.

This patch ensures we set this attribute as well, maintaining
compatibility with the old library.

Fixes compatibility with the WMI module

Currently, in the case of association classes, PyMI returns only
the references to the associated objects as strings, while WMI
converts them and returns the objects.

This patch changes the behaviour of PyMI in case of association
classes by returning the objects as WMI does.

Removes unnecessary try-except

The try-except isn't needed anymore since there is already
the mi_to_wmi_exception wrapper which takes care of the error
handling.

This also fixes a compatibility issue with the old WMI in the way
errors are handled. The old WMI is raising an exception in this
case while PyMI is ignoring the exception and returns None.

Adds support for DestinationOptions when creating a session

Normalize line endings to Unix style

Fixes get_class when the class has no attributes

Doing "if cls:" will return False in the case in
which the class has no attributes. The class implements
the method __len__() which returns the number of class
attributes and which is also used to test the truth value
of "if cls:". In the case in which the class has only
methods the truth value will be False even if the object exists.

It is enough to compare only the reference of cls with None.

Adds watch_for in the Connection class

_get_method_params is supposed to return a unique Object
in which a method's parameters are mapped. The issue is that
it always returns the same object, which can be modified by
multiple threads, leading to erroneous method calls.

Method now returns a cloned object.

This reverts commit 2403e01b.

wmi: Makes _get_method_params thread safe

_get_method_params is supposed to return a unique Object
in which a method's parameters are mapped. The issue is that
it always returns the same object, which can be modified by
multiple threads, leading to erroneous method calls.

Method now returns a cloned object.

The watch_for method is missing from the Connection class.
It is needed for maintaining a consistent interface with wmi.

Update com error excepinfo