Try to improve consistency

- Makes code formatting more consistent with the C++ codebase. Probably removes some trailing whitespace. Maybe it would be best to commit an Eclipse or IntelliJ code format preferences file?
- Removes obscure suppressions. I personally think it's better to only suppress warnings that javac complains about. Suppressing a lot of non-standardised warnings (many of them turned off by default even in IntelliJ) just creates needless clutter.
- Fixes some trivial warnings instead of suppressing them. serialVersionUID is sort of stupid, but I'd rather mentally ignore it or just fix it if it's really that annoying.

Signed-off-by: TheKodeToad <TheKodeToad@proton.me>

libraries/launcher/net/minecraft/Launcher.java

@@ -72,12 +72,12 @@ import java.util.TreeMap;
  */
 public final class Launcher extends Applet implements AppletStub {
 
+    private static final long serialVersionUID = 1L;
+
     private final Map<String, String> params = new TreeMap<>();
 
     private Applet wrappedApplet;
-
     private final URL documentBase;
-
     private boolean active = false;
 
     public Launcher(Applet applet) {
@@ -85,11 +85,11 @@ public final class Launcher extends Applet implements AppletStub {
     }
 
     public Launcher(Applet applet, URL documentBase) {
-        this.setLayout(new BorderLayout());
+        setLayout(new BorderLayout());
 
         this.add(applet, "Center");
 
-        this.wrappedApplet = applet;
+        wrappedApplet = applet;
 
         try {
             if (documentBase != null) {
@@ -109,12 +109,12 @@ public final class Launcher extends Applet implements AppletStub {
     }
 
     public void replace(Applet applet) {
-        this.wrappedApplet = applet;
+        wrappedApplet = applet;
 
         applet.setStub(this);
         applet.setSize(getWidth(), getHeight());
 
-        this.setLayout(new BorderLayout());
+        setLayout(new BorderLayout());
         this.add(applet, "Center");
 
         applet.init();