Add an option to disable smoothing

This can improve performance on less-powerful computers.

macrovision.css

@@ -33,6 +33,9 @@ body {
     -moz-user-drag: none;
     -o-user-drag: none;
     pointer-events: none;
+}
+
+body.smoothing .entity-box {
     transition: left 0.2s cubic-bezier(.1,.41,.18,.99), top 0.2s cubic-bezier(.1,.41,.18,.99), height 0.2s cubic-bezier(.1,.41,.18,.99), max-height 0.2s cubic-bezier(.1,.41,.18,.99);
 }
 
@@ -1107,4 +1110,4 @@ body.screenshot-mode #menubar,
 body.screenshot-mode #options,
 body.screenshot-mode .scroll-button {
     display: none;
-}
+}

macrovision.js

@@ -2342,6 +2342,18 @@ const settingsData = {
             toggleBodyClass("toggle-entity-glow", param);
         }
     },
+    "smoothing": {
+        name: "Smoothing",
+        desc: "Smooth out movements and size changes. Disable for better performance.",
+        type: "toggle",
+        default: true,
+        get value() {
+            return checkBodyClass("smoothing");
+        },
+        set value(param) {
+            toggleBodyClass("smoothing", param);
+        }
+    },
     "solid-ground": {
         name: "Solid Ground",
         desc: "Draw solid ground at the y=0 line",
@@ -4430,4 +4442,4 @@ function panTo(x, y, height, xSpeed, ySpeed, heightSpeed, timestamp, remaining)
     config.y = newY;
     config.height = math.unit(newHeight, "meters");
     updateSizes();
-}
+}