FOSS gamedev and creative worlds

I think that fov should be able to be changed via lua but if players dontnlike fov changes they can set it in the minetest.cont server_fov = false

I don't really like how fov becomes higher when people run in Minecraft (and in World Of Padman too.) Of course, lua support for changing fov could be useful sometimes. It could be used to simulate how a bumble bee sees the world.

Similar https://github.com/minetest/minetest/pull/385, and this would be better as client lua-api.