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Protect req_func_modality from too repentine changes

req_func_modality (see #59) is connected to a physical selector that may change value too quickly. Add a timer in ioeventnotifier.c to:

  1. Ignore changes that do not last for at least T1, to be set in the configuration (default: 1 seconds)

  2. Consider changes only after a proper timeout T2, to be set in the configuration (default: 10 seconds)

To better explain 2: when a value changes (i.e. new value last for T1), proper actions are immediately taken, but new future changes are considered again only after time T2.