2 extensions for Nucleo_F4x1: toolchain ARM_GCC and test DigitalIn DigitalOut

- adds the toolchain ARM_GCC for Nucleo_F411RE:
    basis for extension are linker and startup script of F401RE with changes in RAM size and isr vector table

- changes the test: DigitalIn DigitalOut for Nucleo_F401RE and Nucleo_411RE boards