Add Report Moderation Tool

This MR currently adds the initial page of the Report Moderation Tool

Known Issues

• Binding loops in ReportToolPage.qml are not yet addressed
• The logic of origin filtering the account is not perfect. I am assigning the delegate.implicitHeight = 0 for the element that returns (delegate.reportInfo) === null in qml frontend and in cpp backend I am returning std::shared_ptr<ReportInfo>(); for the null results, which works but makes the code a bit complex : (.
• Assigning the type of rule is still not functional.
• Reported status of type poll not yet visible.
• The application crashes while unassigning an account.
• No way to go to the account's moderation page yet from the report tool.

Images