Label Index File Format
Label index files (*.lbl, *.txt) are ascii files used by Duff and SHIVA.
Each line contains information of the label id, color (optional),
tag name, and the long description. The fields are separated by a tab character.
Without Color:
id tag description
With Color:
id 0xrrggbb tag description
The color field sometimes may not be in a full six digit hex number, but
the writer should attempt to produce all six digits.