Refactor Alerts

[Psycast]

• Use a single Alert Display instead of creating a new one each time.
• Make it into a static class so using a reference through GlobalVariables isn't needed.
• Only add/remove event listeners when needed instead of between every alert.

This should fix lag with Alerts during gameplay due to rapid creation/destruction of textfields, which has been mitigated.

Fixes issue #269.

[Zageron]

• Use a single Alert Display instead of creating a new one each time.
• Make it into a static class so using a reference through GlobalVariables isn't needed.
• Only add/remove event listeners when needed instead of between every alert.

This should fix lag with Alerts during gameplay due to rapid creation/destruction of textfields, which has been mitigated.

Fixes issue #269.

When were alerts happening during gameplay?

[Psycast]

When were alerts happening during gameplay?

Multiplayer has them for multiple things:

• Spectator / Player Switch
• PM
• Connection Lost