Migrate usages of deprecated API in implementation & warning fixes #1382
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I tried to run inspections on the whole project to migrate deprecated column access API in the implementation.
Found that it's safe to replace ColumnAccessor overload when argument is either ColumnPath or actual ColumnAccessor. With FrameColumn or anything that contains actual data, migration path is not clear (see GroupByImpl for example)
Fixed some style issues / warning in the process.