iTowns / itowns / 1237

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Pull #1303

travis-ci-com

feat(label): add a first implementation of Labels

This commit has two main aspects:
- `Label` object, which represents a text and/or an icon. It has a 3D
position, and it is displayed through DOM.
- `LabelLayer`, which is managing the present labels on a scene. It can
be created on its own, or it can get data from another layer.

There has also been some update in the `vector_tile_raster_2d` example,
as well as in the parsing of vector tiles and style.

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