WIP: Support multiline strings

Changes corresponding to ghc!12089 (merged)

Don't merge this MR until other MR is merged. See instructions in other MR for more details.

mentioned in merge request ghc!12089 (merged)

added 3 commits

• 980facc8...08cfa301 - 2 commits from branch ghc-head
• aec6a1c8 - Support multiline strings

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added 5 commits

• aec6a1c8...4cd320ac - 4 commits from branch ghc-head
• 012eec72 - Support multiline strings

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added 12 commits

• 012eec72...cd5f0d40 - 11 commits from branch ghc-head
• d4707b04 - Support multiline strings

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added 1 commit

• 79cae26b - hypsrc-test: Fix output of PositionPragmas.html

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added 8 commits

• 79cae26b...c9bc29c6 - 7 commits from branch ghc-head
• e46d941a - Support multiline strings

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Merged into other MR

closed