tools: add a wrapper script for starting files from file managers and make wine.desktop use it

[Vincent Povirk]

This is an attempt to solve the problems with double-clicking .exe
files from file managers.

The patch adds a script named winestartfile that mimics what happens
on windows when a file is double-clicked in explorer. It starts the
file using start.exe with the full path to the file and in the
directory that contains it.

It also modifies the wine.desktop shortcut to use that script when
opening .exe files.

My previous attempt at this incorrectly ran start without giving a
full path (so that if a file named start.exe exists in the current
path, it will take precedence) and probably tried to change too many
things at once.

-- 
Vincent Povirk
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