fix strange behavior on Backspace press in ST

Before:
if text was selected and cursor was at indention, one indention (two
spaces) was removed.

if cursor was at start position of the line, then nothing happened.

if cursor was in the middle of indention then on backspace more
indention were added


Now:
if text is selected, it will be removed.
if cursor is at start position, then new line will be removed.
if cursor was in the middle of indention one indention is removed.

fix close button in system menu for AboutDialog on Windows


If SetEscapeId receives wx.ID_CLOSE as parameter, then on Windows with
wxPython 2.8 system close button in title bar stops working.
If wx.ID_CANCEL or wx.ID_OK is used in SetEscapeId call, then close
button works correctly.

make renames caseinsensitive

fix problem with SFC action/transition rename

Traceback (most recent call last):
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line
1636, in OnProjectTreeItemEndEdit
elif new_name.upper() in [name.upper() for name in
self.Controler.GetProjectPouVariableNames(pou_name) if name !=
old_name]:
NameError: global name 'pou_name' is not defined

fix problem that it was impossible to edit SFC jump, if it references non-existent SFC step

remove all corresponding SFC jumps when SFC step is removed (but only in DRIVENDRAWING_MODE)

rename all corresponding SFC jumps when SFC step is renamed (but only in DRIVENDRAWING_MODE)

add check of new project path in Save As
add dialog window if selected directory is the current directory project, or already contains another project

fix issue that in Debug mode LD instance doesn't show correctly its state after
continuation of FBD_Connector.

Previously state signals doesn't propogate through FBD_Connector.

fix issue with task rename if "Name" column label is translated into
other language

fix issue with compiling SFC POU with non-connected transition (type "connection")

fix bug with recent projects menu, remove path to the project from menu, if project directory doesn't exist