wxWidgets support files

I've fixed my wxWidgets build files to support the latest
BJam.

Usage guide:
1. Unzip archive to BBv2/tools directory.
2. Define WX_HOME environment variable on Windows (POSIX
systems need 
wx-config script to be present somewhere in PATH).
3. Use it :
==============
import wxWidgets ;

exe test-app
	:
		source.cpp

		# Link some WX libraries (see wxWidgets.jam for full
list).
		/wxWidgets//wx-base
		/wxWidgets//wx-core
	;
==============

There is  still some work to do:
1. Add support for DMC and Watcom (which were unsupported
when I wrote 
wxWidgets.jam)
2. Eliminate code duplication in POSIX and Win32 versions.
3. General code cleanups.

-- 
With respect,
             Alex Besogonov (cyberaxelewise.com)
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