richedit: (5/9) EM_LINELENGTH: honor CR and LF counters.

[Alex Villací­s Lasso]

Changelog:
* EM_LINELENGTH: honor CR and LF counters.
* Add fixup to ME_FindItemAtOffset(), fixes crash by null-pointer access.
* Add tests for EM_LINELENGTH.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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