Drop support for Drupal 8 in 2.1.x.

Also raise PHP minimum version to 7.3+, which is identical to Drupal 9 requirements.

Closes #3339545

changed target branch from 2.0.x to 3.0.x

added 6 commits

• 9382dca3...415c8586 - 5 commits from branch project:3.0.x
• e8d5831e - Merge branch '3.0.x' into '3339545-implement-hookhelp'

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added 1 commit

• 7e780790 - Issue #3339545: Implement hook_help()

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added 1 commit

• 226ab427 - manually added html

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added 1 commit

• 19a38860 - Simplify help text - point to README

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added 1 commit

• cd27b1cc - Unused use statement

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added 1 commit

• b464ecb4 - Linting

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started a merge train

merged