Adds three options, on read, on write, and both. Always Breaks and Logs.

Changes it to select rows then extracts one item from each row to operate on. The behavior and data across each item in a row was already identical, so using rows doesn't change anything.

Yellow squiggly lines begone!
Done automatically on .cpp files through `run-clang-tidy`, with manual corrections to the mistakes.
If an import is directly used, but is technically unnecessary since it's recursively imported by something else, it is *not* removed.
The tool doesn't touch .h files, so I did some of them by hand while fixing errors due to old recursive imports.
Not everything is removed, but the cleanup should be substantial enough.
Because this done on Linux, code that isn't used on it is mostly untouched.
(Hopefully no open PR is depending on these imports...)

Instead of just the right-clicked item.

Rename m_session to m_last_value_session to better reflect its meaning
and distinguish it from m_current_value_session which will be introduced
in another commit.