At91sam9260

memheap: don't alloc/memcpy when there is next node is enough for realloc

When realloc a bigger space and the next node is free and big enough, we
should directly relocate the next node instead of doing alloc/memcpy.
The new method not only faster in this cases, it would avoid memory
fragment as well.

update stm32f10x.

fix compiling error in Linux.

simulator: update code for new component initialization support on mingw

update linker script and SConstruct.

add K60Fxxxx bsp for TWR-K60F120M board.

Remove initialization feature for MS VC++ compiler.

enhancement hard fault exception handler.

building.py: add clang static analyzer support

device: add ref_count support

It adds the '--clang-analyzer' option that could invoke clang as the
static code checker. It is recommanded to work with 'scan-build' shipped
with Clang. For example, `scan-build scons --clang-analyzer`.