Increase camera render distance when adding clouds

[TheDuckCow]

At the moment, when adding clouds to a default scene, though visible in the viewport, a user moving into camera mode might see them disappear. This is because the default camera render far-plane is only 100 units. The proposal would be to tenfold increase this to something like 1000 or 1500, for the best view-ability of the cloud shader falloff.

To drive consistency, this should apply to all cameras present in the scene at the time of using the Create Sky operator. It should be up to the user to manage clipping distances if they add new cameras afterwards.

This feedback was provided by at least one http://bit.ly/MCprepSurvey response, and has been mentioned in one or two comments elsewhere too.

[TheDuckCow]

Implemented now in dev, will be part of the 3.2.4.1 release.