Updated versions of ChibiOS/RT, NilRTOS, and FreeRTOS

I understand the problem. TwiMaster uses a semaphore when linked with Nil RTOS so Nil RTOS must be started to do I2C I/O.

Move bmp.begin() here:

Yep, it works now.
Bmp stuff takes 22ms now (35ms with wire).

A high time to replace _delay_ms() with chThdSleep() in the bmp driver..
Not easy, though..