Use a shared url for news updates. Fixes #5603.
Reorganize news parsing.  Fixes #5647.
Merge pull request #5860 from pchote/news-fix

News fixes
Overhaul ParatroopersPower:

- Adds support for multiple drop planes.
- Adds support a beacon and camera.
- Prevents the plane from circling if it can’t unload.
Fix the crate drop.
Merge pull request #5859 from pchote/paratrooper-cleanup

Improve paratroopers.
generalize MoveFlash as parametrized SpriteEffect
add the sonar pulse

closes #4729
add a ripple animation based on the move flash
generalize into SpawnActorPower

closes #5724