Feature/pt fix sql concatenation in gateways

What does this MR do?

removes sql injection possibilities from all already existing gateways.

How confident are you it won't break things if deployed?

Quite. It is only refactoring and tests pass.

Checklist

• added a test, or explain why one is not needed/possible... (no new functi.)
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))

added 1 commit

• 26c797c4 - changelog

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added 1 commit

• 727447ef - removed empty parameters

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added 1 commit

• ab8e6fcf - fixed duplicated named parameters issue.

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resolved all discussions

approved this merge request

added 29 commits

• ab8e6fcf...b05c9334 - 21 commits from branch master
• 6c4da947 - Fixed SQL concatenation in Activity
• d4107a60 - Fixed SQL concatenation in API
• 630b4832 - Fixed SQL concatenation in FairTeiler
• 0d978b71 - Fixed SQL concatenation in Report
• 6bfe2d23 - Fixed SQL concatenation in Team
• e1ff8439 - changelog
• 03db2680 - removed empty parameters
• b29f32fa - fixed duplicated named parameters issue.

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merged

changed milestone to %July 2018 hackweek