allow texture streaming(png, jpeg for now) and use texture url instead of passing textures in base64

assets/web/app.js

@@ -145,7 +145,7 @@ tavern.onspawntoken = (t) => {
     token.style.left = `${t.x * GRID_SIZE}px`;
     token.token_id = t.token_id;
     token.innerHTML = `
-    <img src='data:image/jpg;base64,${t.img}' ondragstart='return false;'>
+    <img src='${t.img}' ondragstart='return false;'>
     `
     token.onmousedown = (e) => {
         token.classList.remove('token-transition');