CB build system update

changes (including commit 571b8ed1e43685413ae39b207d29f09a450efc7a)
(other than adding/removing/moving/renaming files)

-updated boost headers and libs to 1.57
-added defines _WIN32_WINNT=0x0501 and DWINVER=0x0501 since otherwise
a boost header from asio doesn't compile
solution found here:
http://stackoverflow.com/questions/18793605/boost-asio-netbeans-error
It is the minimum target system of the created application, 0x0501 means
windows XP, the lowest officially by wesnoth supported windows OS.

Modified my existing package using Pentarctagon's thread (and .bat file)
http://forums.wesnoth.org/viewtopic.php?f=5&t=40694&sid=84843537e1f713bf9805db75f0a4f94b
until I got 1.12 and master to build and execute with it.
CodeBlocks uses the recent boost filesystem fix now.
The package is available at
http://sourceforge.net/projects/wesnoth/files/unofficial/Windows%20Compile%20Stuff/