Render prediction fields in a worker, simplify loading indicator#257
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This pull request moves the rendering of the global fields prediction layer to a worker.
The approach used here is basically what's done in https://openlayers.org/en/latest/examples/tiled-layer-rendering-in-offscreen-canvas.html.
In addition, the logic for the map loading indicator is simplified - OpenLayers has
loadstartandloadendevents on theMapfor that. No need to keep track of rendered tiles.