shell32[2/4]: add trashing support functions

[Mikołaj Zalewski]

These patches adds trashing function. It implements the freedesktop.org 
trash. It's a limited version that can trash only files, only on the 
same filesystem as the home trash and only if they can be move to the 
trash with a rename(2) - I wanted to keep the patch small. However it's 
supposed to do it correctly, fully supporting the standard.

The patch contains also some generic code in xdg.c that might be needed 
to implement other freedesktop.org standards.
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