Fix issues

Issue #4 (closed) : Added find traces to run on a thread with progress window.

Issue #6 (closed) : Removed sfx when using slider.

Issue #7 (closed) : Fixed issue where not all blockettes were recognized in Blockettes tab.

Issue #8 (closed) : Fixed issue where selecting the unique radio button didn't show multiplex file info.

Issue #11 (closed) : Unique's select keys drop down should now display multiplexed traces and apply a filter.

This merge request also addresses issues #9 (closed) and #10 (closed).