Clean Itowns folder

[valentinMachado]

This issue aim to clean the folder packages/browser/src/Component/Itowns. The code in that folder is used by our Widget and propose some features to itowns framework, in order to contribute our widget in itowns/widget we have to:

• add these features to itowns, if they are relevant/necessary
• refacto our widget using exclusively itowns, if they are not

In anycase this folder should be "empty", or at least be considered as a "buffer of code" the time to mature it and to add it to itowns. Note that we could have a folder ItownsUtil where we could have code as AddLayerFromConfig which should not be in itowns (and not in our Widget) but is very useful in an @ud-viz/browser context (to create application).

As there are many code in that folder, I propose to open an issue for each folder/file in that folder, to discuss them one by one.

• Move AddLayerFromConfig to ItownsUtil #586
• Clean TemporalModel #587
• Clean LayerManager #588
• Move Itowns/Component to ItownsUtil #589
• Clean 3DTiles #590

This thread is to keep a global track of this work. And to define where are priorities.

related #537

[valentinMachado]

First issue that should be solve => #594

[valentinMachado]

After discussion of #594 its appears to me that CityObject is not doing something functional (since batch id is an equivalent) and moreover can be confusing since other object in our pipeline are called cityobject and are not equivalent.

Since quite everything in the Itowns folder depends of CityObject quite everything have to be refactored.

Except StyleManager which is buffering a CityObjectStyle (that should be replace by the Style class of itowns) associated to a CityObject (that should be replace by batch id) here I have not found new feature to propose to itowns.

So here is what I going to do:

• Remove everything
• Implement the buffering Style system in a 3DTile context (and then propose it to itowns)
• Extract static util method as apply a material to specific batch id and so on, I'll try to use itowns API the more I can.
• apply a style to a batch id (first implementation will be fill color is the color of the material)
• update all widget