mcedit: Center current line in middle of screen

[Sebastian Gniazdowski]

I've finished coding the support, see
https://midnight-commander.org/ticket/4175 for a patch.

I'm thinking that such feature has a minor drawback which can be
additionally addressed – it is little offensive, IMO, to human brain to
observe such jumps. I feel this way basing on the relief that I've noticed
when I moved from Vim to MCEdit recently. I was doing "zz" command very
often there. I would guess that this has something to do with "rapidly
changing pictures" topic in neurobiology.

To address this, I propose an enhancement: to move display little slowly,
gradually, just to not rudely cut the states of before and after the move.
I could use the timers but I've noticed that timer.c has been removed
recently. Why?
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