Added voice filtering for copy paste
Added test for filtering of voices
Added test for copy paste of second voice
Fixed range selection change to none when no elements are in range.
Made voice filter to work for delete
Added test for delete of a single voice
Added delete in selectionrangedelete tests
Added clipboard check in canWrite methods
Removed unused code in select.cpp
Fixes spaces
Merge pull request #1106 from BartlomiejLewandowski/voice-filter

Voice filter