[Cin] ChromakeyHSV menu much improved

[Phyllis Smith]

Checked into GIT an anonymous contribution for a much improved ChromakeyHSV
menu to include:

1) Now there are individual boxes on the left side where you can either
keyin a distinct value or use the up/down arrows to change the value.  This
gives you a much better control than where previously you could only move
the slider to jiggle the number you wanted.  Also, much easier to see what
all the values are at once whereas before you had to click on each
individual diamond setting to see just 1 value.
2) You can reset individual parameters to the default.  Before you could
only reset them all so you would lose a particular value you were already
happy with.
3) The menu is more visible over a larger space making it easier to see.
4) Plus some minor code cleanup to eliminate at least 1 duplicate line and
to put some "int" on same lines as statement.

P.S. Someone indicated that ChromakeyHSV had some kind of bug, but I was
wondering if Andrea ever found out exactly what that was? since it looks OK
to me.
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