Removed sonar project file.
Feature, "disabling history" disables clipboard.

Previously, disabling the history would only disable new values from
being appended to the history. While this satisfied the feature's name,
it didn't do it in a meaningful way.

In such a state, clip still hijacked the actual clipboard content, which
is unnecessary and annoying.  This change allows for better
interoperation with programs that use the clipboard for non-textual
content.