[EXPORT] [NUCLEO_F4x1RE] and [DISCO_F407VG] export to CoIDE

- export project with export_test.py
- projects can be compiled, downloaded and debugged with CoIDE 1.7.7
- STM32F411xx is not yet supported directly by CoIDE
- STM32F401RE it not supported but STM32F401RB is (differences in flash
size)
- but the generated project files for the Nucleo boards contain correct
FLASH and RAM sizes and that seems to be enough
Merge pull request #499 from ohagendorf/develop_coide

[EXPORT] NUCLEO_F4x1RE, DISCO_F407VG -  export to CoIDE