Add changelog fragment for voice camera tilt (#1520)

changelog.d/1520-voice-camera-tilt.md

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+- Voice "tilt the camera" works from the top-down view a fly-to lands on: the
+  camera swings about the place under the crosshair, keeps its heading, and can
+  tilt to a spoken angle ("tilt 45 degrees") or a default oblique view. A tilt,
+  orbit, pan or rotate said with a fly-to ("fly to Paris and orbit it") now
+  waits for the flight to land (Manjunath, @manjunath22466, #1520).