[winedbg] Get expressions working again.

[Oliver Stieber]

Hi,
This patch starts to get expressions working again and
also allows derefrencing where there is no explicit
type for that dereference. e.g. 

(short)0x12356  now returns the correct value instead
of an error

*((int *)0x23467)  is now a valid expression.
and 
***((int ***)0x23467) should also work properly.

This should also fix watches with expressions but I
haven't given it much testing.

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