Feature/revised asset groups

[Flix6x]

Description

Allow custom asset groups to swallow default asset groups based on asset type. This is useful for plugins to e.g. override the default asset groups.

Look & Feel

Before:

After:

How to test

Example flexmeasures.cfg entry:

FLEXMEASURES_ASSET_TYPE_GROUPS = {
    "projects": ["smartbuilding.simulation"],
    "scenarios": ["smartbuilding.scenario"],
    "sites": ["smartbuilding.site"],
    "renewables": ["solar", "wind", "smartbuilding.PV"],
    "buildings": ["building", "smartbuilding.building"],
    "batteries": ["battery", "smartbuilding.battery"],
    "charge points": ["one-way_evse", "two-way_evse", "smartbuilding.chargepoint"],
}

Note that the Tariffs group is shown in both images, but not defined here in the config, nor is it swallowed by one of the custom groups. It is coming from the asset type tariff (asset types are shown pluralized and capitalized when shown as a group on the dashboard).

Further Improvements

It would be nice to be able to assign default icons to asset types, for example, using Font Awesome strings, in the database table for asset types. But this would be a larger project, also involving UI work.

[victorgarcia98]

Nice! No more infinite scrolling to the right on the main page.

Note: I also try it out locally and works for me.