fix issues in PLCOpenEditor with moving from wxWidgets 2.8 to 3.0

1)
./PLCOpenEditor.py:63: wxPyDeprecationWarning: Using deprecated class PySimpleApp.
app = wx.PySimpleApp()

2)
./PLCOpenEditor.py:475: wxPyDeprecationWarning: Call to deprecated item.
wx.InitAllImageHandlers()

3)
Traceback (most recent call last):
File "./PLCOpenEditor.py", line 480, in <module>
frame = PLCOpenEditor(None, fileOpen=fileOpen)
File "./PLCOpenEditor.py", line 163, in __init__
IDEFrame.__init__(self, parent)
File "/tmp/f/beremiz/IDEFrame.py", line 657, in __init__
self._init_ctrls(parent)
File "/tmp/f/beremiz/IDEFrame.py", line 485, in _init_ctrls
self._init_icon(prnt)
File "/tmp/f/beremiz/IDEFrame.py", line 476, in _init_icon
if self.icon:
AttributeError: 'PLCOpenEditor' object has no attribute 'icon'

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>

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<PyFile>

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  <variables/>

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  <globals>

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<![CDATA[

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from threading import Thread

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def OnConnectButton(self, event):

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  def OnWiiConnected(mac_addr):

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    self.label_2.SetLabel(

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      "Wiimote %s connected"%mac_addr 

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      if mac_addr else 

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      "Wiimote connection failed !")

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  def WiiConnected(mac_addr):

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    wx.CallAfter(OnWiiConnected,mac_addr)

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  Thread(target = Connect_Wiimote, args = (WiiConnected,)).start()

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  self.label_2.SetLabel("Press wiimote 1+2")

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  event.Skip()

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def OnDisconnectButton(self, event):

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  Disconnect_Wiimote()

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  self.label_2.SetLabel("Wiimote disconnected")

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  event.Skip()

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]]>

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  </globals>

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  <init>

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<![CDATA[

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]]>

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  </init>

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  <cleanup>

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<![CDATA[

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]]>

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  </cleanup>

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  <start>

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<![CDATA[

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]]>

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  </start>

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  <stop>

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<![CDATA[

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]]>

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  </stop>

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</PyFile>