New badges for Issue and Merge request list items

Issue #169

• Issues

  • Due date expire badge
  • Confidential badge
  • Tasks badge
  • Locked badge
  • Weight badge
  • Milestone badge

• Merge requests

  • Tasks badge
  • Milestone badge
  • Locked badge

I was unable to split this MR into Issues and Merge requets cause of they are using shared model TargetBadge.Icon. So if i split this into two MR they will be conflicting with each other on merge.