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.

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.

OnResetClicked and GenerateARCode appear to have been using the CPUThreadGuard in error.

At the end of each frame automatically update the Current Value for
visible table rows in the selected and visible CheatSearchWidget (if
any). Also update all Current Values in all CheatSearchWidgets when the
State changes to Paused.

Only updating visible table rows serves to minimize the performance cost
of this feature. If the user scrolls to an un-updated cell it will
promptly be updated by either the next VIEndFieldEvent or the State
transitioning to Paused.