Various fixes for source-position information#210

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QuietMisdreavus wants to merge 3 commits intogithub:masterfrom QuietMisdreavus:sourcepos-fixes

+33-8

Commits on Jan 27, 2021

apply block offsets for autolink source position info
QuietMisdreavus
committed
don't let blocks get end lines before their start lines
QuietMisdreavus
committed
properly set image/link sourcepos when spanning multiple lines
QuietMisdreavus
committed