[leveller] Leveller 2.5 alpha build 1348 available

Leveller 2.5 alpha now at build 1348.


- Fullscreen map and scene render targets available for
   the View, Render... command. For a fullscreen map, the
   entire heightfield is displayed regardless of how it appears
   in the map pane. Press Esc to close the fullscreen display.

- FOV parameter removed from flight/edit rendition style dialogs.
   It was confusing to have separate FOVs for different styles, so
   they are now set in one place (the normal render style).


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