Add event timer for Convergences instance event

[gamingrobot]

• Added new Convergences (Public) event https://wiki.guildwars2.com/wiki/Convergences
• Bump manifest.json version

Discussion Reference

All new features must be discussed prior to code review. This is to ensure that the implementation aligns with other design considerations. Please link to the Discord discussion:

Not a new feature

Is this a breaking change?

Breaking changes require additional review prior to merging. If you answer yes, please explain what breaking changes have been made.

No

[dlamkins]

Looks great! Will merge and deploy in the morning. 👍