General improvement

[fxi]

Idea of development

• [ ] Numeric/Time Slider/Text search box should be optional. Check box or something.
• [ ] New Numeric filter with associate editable labels.
• [ ] Style custom : Use Brace to set raw mapbox gl style, source and legend. Or Pure js editing.
• [ ] Custom style for GeoJSON (client side)
• [x] List errors and warning in modal to explain with words why the current action is blocked or not.