Fix warnings and increase MSRV for 2.0 #508
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This includes some warning fixes as well as a MSRV increase from 1.17.0 to 1.24.0 (which is the oldest release the replacements for the deprecated functionalities are available). The first commit should be least controversial as it doesn't require any MSRV increase. Please say whether MSRV increases are a problem, if they are I can put the first commit into a separate PR.
Fixes #455
This change is