Merge pull request #372 from pangweishen/master

update the change logs
support rx62n
add rx62n driver library file
Merge pull request #374 from limxuzheng/master

add a support for rx62n
update RW009 driver: add softAP support.
Merge pull request #375 from aozima/pulls

update RW009 driver: add softAP support.
SCons: allow set object files in DefineGroup

The source files can be the raw file names end with .c or .o. So return
the raw file names is more flexible than wrap them with Object.
Merge pull request #376 from grissiom/tools-next

SCons: allow set object files in DefineGroup
efm32: return empty variable instead of Return('')
Delete trailing whitespace
Add mdk5 support in SCons tools
Add mdk5 project for stm32 bsps
Merge pull request #378 from grissiom/tools-next

efm32: return empty variable instead of Return('')
Merge pull request #381 from bright-pan/master

Add mdk5 building
Fix compile warning: variable "c" was declared but never referenced, when RT_USING_CONSOLE is disable.
[BSP] Port to NuMicro M051 Series support for Nuvoton corp.
    1. adapt to M052xDN/xDE, M054xDN/xDE, M058xDN/xDE, M0516/xDN/xDE.
    2. support heap memory management.
Port to gcc and fix keil project
Merge pull request #384 from bright-pan/master

[BSP] Port to NuMicro M051 Series support for Nuvoton corp and fix compile warning
Add uart driver and finsh function
Merge pull request #386 from bright-pan/master

Add uart driver and finsh function