building: PrepareBuilding forgot to declare BuildOptions as global

The global variables in the building.py are totally a pile of shit.

Add bsp_directory for PrepareModuleBuilding function and module building environment can parse rtconfig.h too.

[bsp] add uart4 driver for stm32f10x bsp.

[BSP] TM4C129X Fix bugs and errors.

Port Nanopb[zlib license] for protocal encode/decode

format. It is targeted at 32 bit microcontrollers, but is also fit for
other embedded systems with tight (2-10 kB ROM, <1 kB RAM) memory
constraints.(http://koti.kapsi.fi/jpa/nanopb/)

How to use the example:
	1. move examples/nanopb to bsp/xxxx/
	2. enable macro RT_USING_NANOPB in rtconfig.h
	3. regenerate the project file (scons --target=xxxx)
	4. rebuild the project

2. [BSP] TM4C129x : According to LunchPad, change device id from TM4C1294XCNZAD   to TM4C1294NCPDT

sync with official source

Revert "1. [Core] Add INIT_EXPORT_EX micro define. this micro will help the user to organize the start sequence of board/device/application initialization functions."

This reverts commit 0e4bd640.

Fix compile warning

	..\..\libcpu\arm\cortex-m3\context_rvds.S(207):
	warning: A1581W: Added 2 bytes of padding at address 0xd6

修改FreeModbus文件夹名称

更新FreeModbus主机及从机

[DeviceDrivers] Add more sensor drivers.

dfs_win32: add seekdir support, fix #346

Add lwIP/NAT, DHCP server and dlib(LIBC of IAR)