Various configure and build enhancements:
- Auto detect availability of wxWidgets, disable or enable examples build accordingly
- Enhacend (cross) toolchain detection and prefix. Now compile win32 target on linux host (--cc=i686-mingw32-gcc)

Makefile
cancfg.h
Debug UNICODE
cygcan_peak_win32.dll
can_peak_win32.ncb
can_peak_win32.vcproj.KONG.edouard.user
Release