Shared inteerrupts on M0 are not supported

[odinthenerd]

The current code will work if one of the modules which shares the interrupt use it. However if both register the interrupt the compiler will issue an error. We need a work around eventually.

[odinthenerd]

after ISR handling redesign to support multiple interrupts in one device shared interrupts should be easy in the form of an additional step in compiling the list of ISRs which accesses a traits class refined in a chip file to provide proper handling. We can also only switch on proper handling when there actually are two ISRs trying to register in the slot.