entry type:layer to replace mvt_clone

lib/layer/_layer.mjs

@@ -10,6 +10,7 @@ The individual mapp layer modules are exported as mapp.layer{} object to the map
 @global
 @typedef {Object} layer
 A mapp-layer object is a decorated JSON layer object which has been added to a mapview.
+@property {string} layer.srid='3857' Feature layer require a spatial reference identifier (SRID).
 @property {object} layer.L Openlayers Layer object.
 @property {boolean} layer.display Whether the layer should be displayed.
 @property {layer-style} layer.style The mapp-layer style configuration.

lib/layer/featureHover.mjs

@@ -16,7 +16,7 @@ export default function (feature, layer) {
 
   const paramString = mapp.utils.paramString({
     locale: layer.mapview.locale.key,
-    layer: layer.key,
+    layer: layer.Key || layer.key,
     filter: feature.properties.count > 1 && layer.filter?.current,
     template: layer.style.hover.query || 'infotip',
     qID: layer.qID,