Add Ping Zeus keybind

[ampersand38]

When merged this pull request will:

• Add keybind to Ping other Curators on the selected object or mouse position
• Receiving curator will get ping and icon hint, can jump to object
• https://youtu.be/HMo-H6wfMEc
• Close #728

[rautamiekka]

Mmmm, I like the sound of that even without the vid.

[Kexanone]

Could be bound to U by default, which is used in Reforger.

[mharis001]

I added a custom ping animation that grows the icon and fades it out near the end as well as being unique per curator and displaying their name. Also, using our own logic for viewing the ping (moving camera), which is mostly the same as base game for positions but different for objects. Finally, switched back to "Zeus" instead of "Curators" in the stringtable but not sure about the plural for "Zeus" so opted for "Zeus curators" in the description.

@ampersand38 and @Kexanone please review and merge when ready.