Camera height should be relative to water level

[sanderd17]

Currenty, the camera height is only relative to the ground level. So on maps with deep water, it's possible the camera gets submerged suddenly when zoomed in.

And example can be seen on the Golden Island map.

In a less extreme case, the camera can still come very close to the water level, and it's possible to get the camera into some ship.

The camera height should be calculated as being relative to the maximum of the ground and water level

[elexis]

This is very pronounced on Extinct Volcano.

[Stan]

What part of the code is responsible for this ?

[elexis]

In 19896:

Ensure the camera position being above the water level (without smoothing the water level with the terrain).

Differential Revision: ​https://code.wildfiregames.com/D700
Fixes #3892, D229, D638