michael c82e51cf79 fix(intr): always assign the same intr to a same source, disable the source only when all the handlers disabled.
also document handlers sharing a same source.

TW#13454, https://github.com/nodemcu/nodemcu-firmware/issues/1874

Breaking change: handles assigned to a same source should have the same flag now.
2017-09-06 15:20:01 +08:00
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