Resource for Tools are not found on Windows

[Wim Oudshoorn]

I will commit this patch shortly if nobody objects


Problem
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If a tool has resources they are not found (Windows platform only)

Reason
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The resources are stored in a directory containing the toolname
but the toolname is determined from the executable name, which
on windows ends in .exe

Solution
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On the windows platform strip the last pathcomponent from
the executable name when determining the main bundle path

Wim Oudshoorn