fix issue, that was impossible to change variable location IEC-address, when wx 3.0 is used

Merge

fix infinite recursion in 'Reset Execution Order' functionality if FBD body contains feedback connections

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'

update messages and add Russian translation for new menu entry 'switch perspective'

Merged in Surkovsv/beremiz (pull request #4)

Add hotkey (F12) for switching perspective.

Add hotkey (F12) for switching perspective.

Switching perspective feature hides/restores all panels except of the main editor window for current FB.
So all available screen space is used for editor.

Merged skvorl/beremiz into default