launcher : move call to ShowSplashScreen and BackgroundInitialization to PreStart()
It doesn't change behaviour of launcher in beremiz, but may have some impact on some customizations.
Some customizations need to squeeze some bitmap folder init in between app creation and ShowSplashScreen
<?xml version="1.0"?>
<!-- generated by wxGlade 0.7.2 on Mon Jun 5 14:18:29 2017 -->
<application class="" encoding="UTF-8" for_version="2.8" header_extension=".h" indent_amount="4" indent_symbol="space" is_template="0" language="python" name="" option="0" overwrite="0" path="..py.py" source_extension=".cpp" top_window="HMIFrame" use_gettext="0" use_new_namespace="1">
<object class="Class_HMIFrame" name="HMIFrame" base="EditFrame">
<style>wxDEFAULT_FRAME_STYLE</style>
<title>HMIFrame</title>
<object class="wxBoxSizer" name="sizer_1" base="EditBoxSizer">
<orient>wxVERTICAL</orient>
<object class="sizeritem">
<border>0</border>
<option>0</option>
<object class="wxSpinCtrl" name="spin_ctrl_1" base="EditSpinCtrl">
<range>0, 10000</range>
</object>
</object>
<object class="sizeritem">
<border>0</border>
<option>0</option>
<object class="wxCheckBox" name="checkbox_1" base="EditCheckBox">
<label>checkbox_1</label>
</object>
</object>
<object class="sizeritem">
<border>0</border>
<option>0</option>
<object class="wxStaticText" name="label_1" base="EditStaticText">
<attribute>1</attribute>
<label>GUI changed!</label>
</object>
</object>
</object>
</object>
</application>