Auto-apply syntactic sugar

Many constructions in Java can be simplified with syntactic sugar. For example,

```java
foo.ifPresent(value -> value.someMethod());
```

can be simplified to

```java
foo.ifPresent(Foo::someMethod);
```

Also,

```java
foo.methodWithCallback(new Foo.Callback() {
@Override
public void
onDone(int result) {
...
}
});
```

can be simplified to

```java
foo.methodWithCallback(result -> ...);
```

It would be really helpful to have a plugin that could auto-apply all such simplifications.