several fixes to winedbg

[Eric Pouech]

this patch fixes a couple of bugs/regression:
- local vars in expression were no longer accessible (reported by Mike)
- strings we no longer correctly printed
- several fixed in display management
- improvement & fixes for several output templates

it also modifies the 'display' commands which now prints the value of 
'display':s instead of their status (as info display does). This is 
closer to gdb's behavior anyway.

Internally, all types are now stored as a pair module/type_id (instead 
of simply type_id). This is needed for an overall correct type 
management. This change makes the patch quite large.

A+
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