Frontend reports

[an2508374]

This pull request provides the following features:

• options of reporting events, posts, comments and student profiles
• panel for student to show details of created reports and eventually cancel them
• panel for admin to search all reports by some criteria and manage them

Student and Admin can be forwarded to pages of reported elements by suitable buttons from report details dialog. Thanks to Local Storage, searching criteria and chosen report are reloaded after coming back.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.00%. Comparing base (3517e8e) to head (aebd7e4). Report is 118 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #227 +/- ## ========================================== - Coverage 73.18% 71.00% -2.19% ========================================== Files 178 218 +40 Lines 2234 2721 +487 Branches 201 263 +62 ========================================== + Hits 1635 1932 +297 - Misses 543 723 +180 - Partials 56 66 +10 ```

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