simulator: assign the x86 32bit version in Enverionment, or the 64bit version will be built with vs2010 in win7 64bit

simulator: assign the x86 32bit version in Enverionment, or the 64bit version will be built with vs2010 in win7 64bit

fixed DFS elmfat bug.

tools script: fix up mdk460 link error

fixed list_tcps bug: ipaddr_ntoa isn't reentrant.

app module of simulator:update readme.txt, add rtthread.def for default ...

simulator: mingw and  app module support

app module of simlator: simpliy command of building, now use `scons --def` to create rtthread.def which can used by msvc

building.py: append messed up objs list, use extend to avoid that

The return type of SConscript is a subclass of UserList. We should use
extend to keep the depth of the list is always 1 when concatenate
SConscript return values. Thanks prife for making me realize that this
is really a problem.

Reported-and-Tested-by: prife

Add building status image in README

remove gui examples

bsp/stm32f10x: remove the last calibration.c

As part of RTGUI, we should also remove gui examples. Copy
demo/examples/* in RT-Thread/RTGUI to examples/gui in RTT When you need
them.

This also provide an example to show how to use calibration feature in
the RTGUI.

Remove RT-Thread GUI from bsp/efm32