Use correct EXTI handler

[emmanuel-pastor]

The EXTI interrupt handler function on our STM32 are EXTI9_5_IRQHandler, EXTI15_10_IRQHandler, EXTI0_IRQHandler, EXTI1_IRQHandler, EXTI2_IRQHandler, EXTI3_IRQHandler and EXTI4_IRQHandler. (cf. page 197 of the 1137 page doc).

• [x] Change the name of the main EXTI interrupt. Since we use 6 EXTI and at most we can handle 5 in the same function, we should use a seperate handler for at least one interrupt.
• [x] Configure that new interrupt.
• [x] Implement its handler.

[hmathieu31]

Don't worry too much on the configuration of the exti handler, it will be IDE handled

You can use the HAL library doc (found on internet) to know which functions will be implemented and how

Expect a higher implementation abstraction than with the Standard periph lib

[emmanuel-pastor]

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