Factorized common code to avoid code duplication in handling fault interrupts

miosix/_doc/textdoc/Changelog.txt

...2000/lpc2138_miosix_board/interfaces-impl/portability.cpp

miosix/arch/common/core/interrupts.h

miosix/arch/common/core/interrupts_arm7.cpp

miosix/arch/common/core/interrupts_arm7.h

miosix/arch/common/core/interrupts_cortexMx.cpp

miosix/arch/common/core/interrupts_cortexMx.h

miosix/arch/cortexM3_stm32/common/core/interrupts.cpp

miosix/arch/cortexM3_stm32/common/core/interrupts.h

miosix/arch/cortexM3_stm32f2/common/core/interrupts.h

miosix/arch/cortexM3_stm32l1/common/core/interrupts.cpp

miosix/arch/cortexM3_stm32l1/common/core/interrupts.h

miosix/arch/cortexM4_stm32f4/common/core/interrupts.cpp

miosix/config/Makefile.inc