RTIC Monotonic implementation on a pair of 16 bit timers for various STM microcontrollers.
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Select which timer pair to use with features, currently supported:
* `l0x1-tim21-tim22` - STM32L0x1 TIM21+TIM22
* `f0x1-tim15-tim17` - STM32F0x1 TIM15+TIM17
* `f0x1-tim15-tim16` - STN32F0x1 TIM15+TIM16
* `f0x2-tim15-tim17` - STM32F0x2 TIM15+TIM17
* `h743v-tim15-tim17` - STM32H743 rev.V TIM15+TIM17

Other timer combinations are possible as well.