Fix softwrap scrolling issues (#1981)

Fix softwrap scrolling issues (#1981)

Softwrap implementation enhanced to fix various issues with scrolling,
centering, relocating etc.

The main idea is simple: work not with simple line numbers but
with (Line, Row) pairs, where Line is a line number in the buffer
and Row is a visual line (a row) number within this line.
The logic remains mostly the same, but simple arithmetic operations
on line numbers are replaced with corresponding operations on
(Line, Row) pairs.

Fixes #632, #1657