FR: Zoom to ... buttons for Bookmarks and Drawtools

[nexushoratio]

There have been times when I've wanted to just click a button and zoom around to a boundary including all of the current bookmarks or drawings.

It might be something as simple as:

const bounds = window.plugin.drawTools.drawnItems.getBounds();
if (bounds.isValid()) {
  map.fitBounds(bounds);
}

and

const bounds = L.featureGroup(window.plugin.bookmarks.starLayerGroup.getLayers()).getBounds();
if (bounds.isValid()) {
  map.fitBounds(bounds);
}

Heck, fitBounds() may already have a validity check allowing them to simplify further, but this way would allow for feedback in an else.