Ranges are allowed to be any integral type or a double, and `GVariant` doesn't
allow accessing an integer from a differently-sized integer, so we need tests
for all versions.
Testing Done:
Opened plugin viewer and confirmed that all settings were added.
Reviewed at https://reviews.imfreedom.org/r/2152/
/*
* Copyright 2021 Elliott Sales de Andrade <quantum.analyst@gmail.com>
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