Various minor refactors (arduino#1501)

* Factored pluggable monitor creation

* Factored out code duplication

* EnumerateMonitorPortSettings does require only protocol

* Monitor.Open does require only address and protocol

* Added GetPortAddressAndProtocol helper

* fix i18n

* Apply suggestions from code review

Co-authored-by: Silvano Cerza <3314350+silvanocerza@users.noreply.github.com>

Author: 2 people