Update leaflet to 1.3.1

overviewer_core/data/web_assets/leaflet.css

@@ -47,6 +47,7 @@
 .leaflet-container .leaflet-tile-pane img,
 .leaflet-container img.leaflet-image-layer {
 	max-width: none !important;
+	max-height: none !important;
 	}
 
 .leaflet-container.leaflet-touch-zoom {
@@ -55,11 +56,20 @@
 	}
 .leaflet-container.leaflet-touch-drag {
 	-ms-touch-action: pinch-zoom;
+	/* Fallback for FF which doesn't support pinch-zoom */
+	touch-action: none;
+	touch-action: pinch-zoom;
 }
-.leaflet-container.leaflet-touch-drag.leaflet-touch-drag {
+.leaflet-container.leaflet-touch-drag.leaflet-touch-zoom {
 	-ms-touch-action: none;
 	touch-action: none;
 }
+.leaflet-container {
+	-webkit-tap-highlight-color: transparent;
+}
+.leaflet-container a {
+	-webkit-tap-highlight-color: rgba(51, 181, 229, 0.4);
+}
 .leaflet-tile {
 	filter: inherit;
 	visibility: hidden;
@@ -303,7 +313,14 @@
 	height: 30px;
 	line-height: 30px;
 	}
-
+.leaflet-touch .leaflet-bar a:first-child {
+	border-top-left-radius: 2px;
+	border-top-right-radius: 2px;
+	}
+.leaflet-touch .leaflet-bar a:last-child {
+	border-bottom-left-radius: 2px;
+	border-bottom-right-radius: 2px;
+	}
 
 /* zoom control */
 
@@ -312,16 +329,10 @@
 	font: bold 18px 'Lucida Console', Monaco, monospace;
 	text-indent: 1px;
 	}
-.leaflet-control-zoom-out {
-	font-size: 20px;
-	}
 
-.leaflet-touch .leaflet-control-zoom-in {
+.leaflet-touch .leaflet-control-zoom-in, .leaflet-touch .leaflet-control-zoom-out  {
 	font-size: 22px;
 	}
-.leaflet-touch .leaflet-control-zoom-out {
-	font-size: 24px;
-	}
 
 
 /* layers control */
@@ -359,6 +370,7 @@
 	}
 .leaflet-control-layers-scrollbar {
 	overflow-y: scroll;
+	overflow-x: hidden;
 	padding-right: 5px;
 	}
 .leaflet-control-layers-selector {