Sync master into development

[DL6ER]

• Add .github/PULL_REQUEST_TEMPLATE.md (Add Pull Request Template #24)

• Add PullApprove settings file (copied from core repo) (Add PullApprove settings file (copied from core repo) #23)

• Don't forget to free linebuffer also when not used (Don't forget to free linebuffer also when not used #28)

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Please submit all pull requests against the development branch. Failure to do so will delay or deny your request

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