Completes #6048: let FunctionalInterrupt.h support only IRAM-safe scheduled ISRs#6055

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dok-net:scheduled_isrs

Commits on Jun 25, 2019

Properly check for "functional" ISRs and expose C-style attachInterruptArg
dok-net
committed
Add facility that schedules ISRs into loop context instead of running them directly as IRQ handler
dok-net
committed
Refactor FunctionalInterrupt, undo removal of attachInterrupt() for functional arguments.
dok-net
committed