use lodash-es everywhere, replace custom clamp methods with lodash

modules/util/tiler.js

@@ -1,4 +1,6 @@
 import { range as d3_range } from 'd3-array';
+import { clamp } from 'lodash-es';
+
 import { geoExtent, geoScaleToZoom } from '../geo';
 
 
@@ -12,11 +14,6 @@ export function utilTiler() {
     var _skipNullIsland = false;
 
 
-    function clamp(num, min, max) {
-        return Math.max(min, Math.min(num, max));
-    }
-
-
     function nearNullIsland(tile) {
         var x = tile[0];
         var y = tile[1];

modules/util/units.js

@@ -1,3 +1,5 @@
+import { clamp } from 'lodash-es';
+
 import { t, localizer } from '../core/localizer';
 
 var OSM_PRECISION = 7;
@@ -102,10 +104,6 @@ function wrap(x, min, max) {
     return ((x - min) % d + d) % d + min;
 }
 
-function clamp(x, min, max) {
-    return Math.max(min, Math.min(x, max));
-}
-
 function roundToDecimal (target, decimalPlace) {
     target = Number(target);
     decimalPlace = Number(decimalPlace);