Project Scala version updated to 1.12.8; all the IDE & compiler warnings fixed #607
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As discussed in #568 .
lift-json
was also bumped as there was no longer any suitable version for Scala 2.12.x.Also fixed compiler warnings (e.g. eta expansion of parameterless methods is deprecated) as well as some rarther non-controversial IDE warnings (e.g. redundant semicolons and such).