New header meta proposal: 0 !BOM

[Merlijn Wissink]

Seen from an instruction point of view there are currently two different ways to display the annotation:
- Number in a Circle: Axle Length
- Number in a Square: Beam Length and Type of Technic Panel.

So, should we also have a style parameter + enum (plain, circled, boxed)?

I think that it would be best to not include any style information.
Style is something that can and will be changed to whatever the editor and/or user wants, so it would be useless to include style information.