Resolve "Anonymous items"

Closes #68

added size::medium source::customer::teckids type::feature labels

added 4 commits

• dd08c319 - Fix migration history
• a8328d7a - Add anonymous option to item and show it in frontend
• 8f018713 - Fix displaying of datetimes
• bf89e2e3 - Use Core 4.0.0

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added 1 commit

• a608d478 - Implement check out of anonymous items

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added 1 commit

• b6d8c3e5 - Support check in of an. objects

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marked this merge request as ready

assigned to @nik