Move file to datas/
Extract dynamical overpass layer
overpass layer now an instanciable object
get layer from OverPassDynLayer
Fix file name to fit class name
t4t35 is also an object now
Fix t4t35 file name to fit class name
Merge branch 'ExtractModules'

Modularize the layers code, exporting it to js files, as
instanciable objects.