add $(Beremiz installation)/mingw/bin in PATH on Windows platform

This fixes issue if multiple gcc installation are found in user's
PATH. Now gcc from Beremiz is used by default.

fix issue with non-working global hotkeys in IEC code panel

add more comments to svgui example

cleanup traffic lights example

cleanup svgui example

Fix bug with two or more wires connected to one input. Now only one wire can be connected to one input, except BOOLean signals in LD and SFC. If user trying to connect wire with already connected input, wire highlight will become red.
Signed-off-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>

fix issue with sequence of multiple whitespaces in makefile command
line from project configuration

for every additional whitespace '""' was inserted in result command line.

fix minor issue and do some cleanup work in genericmake example

cleanup python example

complete fix in commit 3518d10 for wxgtk2.8