Websocket Stream Stats & Robustness Improvements (#605)

* wip support for a stats overlay

* WIP adding stream stats. But.... eeeh. Corporate.

* kbits over mbytes

* A ton more tweaks:

- Increased thread priority for streaming to reduce "stutter/slow" issues
- revised client side URL creation order to prevent the possibility of repeat-identical URL's
- Improved overlay to only be visible on mouseover, and fully centered in the screen

* wpiformat on js

photon-core/src/main/java/org/photonvision/vision/videoStream/SocketVideoStream.java

@@ -18,7 +18,6 @@
 package org.photonvision.vision.videoStream;
 
 import java.nio.ByteBuffer;
-import java.util.Base64;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.function.Consumer;
@@ -77,16 +76,6 @@ public class SocketVideoStream implements Consumer<Frame> {
         oldSchoolServer.accept(frame);
     }
 
-    public String getJPEGBase64EncodedStr() {
-        String sendStr = null;
-        jpegBytesLock.lock();
-        if (jpegBytes != null) {
-            sendStr = Base64.getEncoder().encodeToString(jpegBytes.toArray());
-        }
-        jpegBytesLock.unlock();
-        return sendStr;
-    }
-
     public ByteBuffer getJPEGByteBuffer() {
         ByteBuffer sendStr = null;
         jpegBytesLock.lock();