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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#!/bin/sh

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LC_ALL=ru_RU.utf-8

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export DISPLAY=:42

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Xvfb $DISPLAY -screen 0 1280x1024x24 &

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sleep 1

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ret=0

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DELAY=400

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KILL_DELAY=$(($DELAY + 30))

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timeout -k $KILL_DELAY $DELAY pytest --timeout=10 ./tests/tools

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ret=$?

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pkill -9 Xvfb

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exit $ret