Crash handler - save to disk

[szabgab]

As suggested by Andreas Lund ( ​http://mail.perlide.org/pipermail/padre-dev/2009-October/001264.html ) when Padre crashes something should catch this crash and save it to a file to allow the user to send it to the Padre developers for analysis.

I guess there are errors perl can catch - we could put an eval block around the whole code right in the padre script (though I am not sure how does it relate to threads).

There are also C-level crashes from wxWidgets and other places that we cannot catch with an eval block.