Fixed Exception dialog disapearing after a view second when exception occurs during app startup.
Problem was caused by splashscreen timeout, wx closing averything else if there is no more main frame.
Changes:
- no more timeout for splashscreen
- use wx.App OnInit method to give first operation to mainloop, object are then now created in mainloop
- main loop is then created _before_ showing splash screen
- no more wxyield or wx processevent tricks needed to display splash screen
- exception handler not blocking anymore on dialog (callafter)
- because of mainloop being there before everything, exit must be called explicitely if exception caught during startup -> exit parameter in handle_exception + try/except around startup calls

UNTESTED ON WINDOWS

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include yslt.yml2

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in xsl {

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    decl istylesheet (

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        *output="xml",

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        version="1.0",

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        xmlns:xsl="http://www.w3.org/1999/XSL/Transform",

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        xmlns:exsl='http://exslt.org/common',

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        extension-element-prefixes='exsl'

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    ) alias stylesheet {

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        output *output;

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        content;

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    };

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    decl template(match) {

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        content;

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    };

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    decl function(name) alias template {

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        content;

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    };

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    decl call(name) alias call-template {

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        content;

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    };

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    decl apply(select) alias apply-templates {

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        content;

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    };

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}

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