implement entity model rendering

(cherry picked from commit a0e5d51290cf521d511f90e23445206a14c4a772)

src/js/net/minecraft/client/render/model/ModelBase.js

@@ -0,0 +1,21 @@
+window.ModelBase = class {
+
+    /**
+     * Rebuild the model
+     *
+     * @param tessellator Tessellator to render vertices
+     */
+    rebuild(tessellator, entity) {
+
+    }
+
+    /**
+     * Render the model
+     *
+     * @param time Animation offset
+     */
+    render(time) {
+
+    }
+
+}