fix(ui): ui callbacks still alive after script exit

autojs/src/main/java/com/stardust/autojs/core/looper/Timer.java

@@ -112,4 +112,8 @@ public class Timer {
         return mMaxCallbackUptimeMillis > SystemClock.uptimeMillis();
     }
 
+    public void removeAllCallbacks() {
+        mHandler.removeCallbacksAndMessages(null);
+    }
+
 }

autojs/src/main/java/com/stardust/autojs/runtime/ScriptRuntime.java

@@ -373,6 +373,7 @@ public class ScriptRuntime {
             ignoresException(images::releaseScreenCapturer);
         }
         ignoresException(sensors::unregisterAll);
+        ignoresException(timers::recycle);
     }
 
     private void ignoresException(Runnable r) {

autojs/src/main/java/com/stardust/autojs/runtime/api/Timers.java

@@ -87,4 +87,8 @@ public class Timers {
         return getTimerForCurrentThread().hasPendingCallbacks();
     }
 
+    public void recycle(){
+        mMainTimer.removeAllCallbacks();
+    }
+
 }