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util: Replace boost::signals2 with std::function

Authored by MarcoFalke <falke.marco@gmail.com> on Aug 13 2018, 20:13.

Description

util: Replace boost::signals2 with std::function

Summary: Thi is a backport of Core PR13961

Test Plan:

make check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D4176