r.horizon: height output feature

[zst86]

Add an option to output a second map when running r.horizon in raster mode, which outputs horizon height in map units, useful for rockfall risk assessment. For example, a pixel below a vertical cliff has a 90° horizon in the azimuth direction of the cliff. This feature is intended to produce a second map that outputs the horizon height, so risk assessments can distinguish between a small or large cliff, which affects the kinetic energy of rockfalls.

[petrasovaa]

@zst86 it looks like there are conflicts that you need to resolve.

[zst86]

Thanks Anna, I will look to resolve these conficts next week when I have time.

[wenzeslaus]

This looks to me like your AI agent is using outdated code base to generate the code.

An update to the documentation, example, image, and a scientific reference will be helpful for the review and the users.