[Parity]: Port Tag/Field Copy and Pasting from v9.4 to v9.5

[CyanVoxel]

Checklist

• I am using an up-to-date version.
• I have read the documentation.
• I have searched existing issues.

Description

Port the copy and pasting functionality of tags and fields (#79) from v9.4 over to the main branch (v9.5)

Solution

Port the features of #79 to the main branch, while accounting for differences in the database schema - most notably those introduced in #655. It would also be nice to finally have the hover icons for copying (similar to the "pencil" edit icon) function as a way to copy tag and field data with a single left-click rather than always needing to use the right-click context menu.

Alternatives

Rebuild the copy pasting system, not being influenced by #79. While there's been some significant changes, #79 at least provides a skeleton of the features needed.