my improvements

[vfosnar]

Hi, I'm using clippy to format the code and it seems it affected some of the files I touched, hope it's not a big problem.

• respect building:colour and roof:colour - get_block_for_color
• fix parsing height for values containing m suffix
• raise height calculation from levels * 3 to levels * 4
• offset floors by 2 to match with the windows
• simple information=board implementation

[louis-e]

Hi there, thank you so much for your contribution! I really appreciate it.
Looks good to me, I'll merge it! I'm currently working on a more memory efficient handling of the chunks in world_editor.rs, as soon as this is finished I'll create a new release including your changes.