feat(import-export): imported file can be styled from a style list

[drekss]

imported file can be styled from a style list.

"importWithStyle" must be true in config.json

the style-list.json is in config and contains the list of style for the import component. A default style is set in this list too.

[drekss]

example of style-list.json
{
"default": {
"style": {
"fill": {
"color": "red"
},
"stroke": {
"color": "black"
}
}
},
"bureaux_locaux": {
"styleByAttribute": {
"type": "circle",
"attribute": "type",
"data": ["local", "regional"],
"fill": ["blue", "red"],
"stroke": ["black", "black"],
"label": "type"
}
},
"countries": {
"style": {
"fill": {
"color": "red"
},
"stroke": {
"color": "black",
"width": 4
}
}
}
}

[mbarbeau]

It could be interesting that the user can pass this style instead of defining all the possibilities.