Improvements to visible whitespace in console output.

[belav]

When whitespace is made visible in the --check format, it can get noisy.

Can it be changed to only show the whitespace at the beginning and end of the line?

Maybe only show the first couple of differences?

Maybe it is possible to use colors, and make the whitespace character blend into the background more?

[belav]

Expanding on the first couple of differences idea - on the line that has the first difference, make whitespace visible from that point until the end of that line, but not visible in any other lines.

[belav]

After testing this out, it didn't really make sense to have whitespace visible except in two cases.

An otherwise empty line has whitespace

----------------------------- Expected: Around Line 4 -----------------------------
    private string field1;

    private string field2;
----------------------------- Actual: Around Line 4 -----------------------------
    private string field1;
····
    private string field2;

A line has extra whitespace at the end.

----------------------------- Expected: Around Line 3 -----------------------------
{
    private string field1;
}
----------------------------- Actual: Around Line 3 -----------------------------
{
    private string field1;····
}

If there is extra whitespace between words, it is obvious without making the whitespace visible.

----------------------------- Expected: Around Line 1 -----------------------------
public class ClassName { }
----------------------------- Actual: Around Line 1 -----------------------------
public class ClassName  { }