[Fix] Fix lint warnings.

Author: zhanghai

library/src/main/java/me/zhanghai/android/fastscroll/FastScrollNestedScrollView.java

@@ -78,6 +78,7 @@ public boolean onInterceptTouchEvent(@NonNull MotionEvent event) {
     }
 
     @Override
+    @SuppressLint("ClickableViewAccessibility")
     public boolean onTouchEvent(@NonNull MotionEvent event) {
         return mViewHelper.onTouchEvent(event);
     }

library/src/main/java/me/zhanghai/android/fastscroll/FastScrollScrollView.java

@@ -87,6 +87,7 @@ public boolean onInterceptTouchEvent(@NonNull MotionEvent event) {
     }
 
     @Override
+    @SuppressLint("ClickableViewAccessibility")
     public boolean onTouchEvent(@NonNull MotionEvent event) {
         return mViewHelper.onTouchEvent(event);
     }

library/src/main/java/me/zhanghai/android/fastscroll/FastScrollWebView.java

@@ -87,6 +87,7 @@ public boolean onInterceptTouchEvent(@NonNull MotionEvent event) {
     }
 
     @Override
+    @SuppressLint("ClickableViewAccessibility")
     public boolean onTouchEvent(@NonNull MotionEvent event) {
         return mViewHelper.onTouchEvent(event);
     }

library/src/main/res/drawable/afs_thumb_stateful.xml

@@ -21,7 +21,10 @@
   ~ that GradientDrawable didn't actually implement tinting until Lollipop MR1 (API 22). So if you
   ~ need to support API 21, you'll need to work around it yourself.
   -->
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
+<selector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:ignore="UnusedResources">
 
     <item android:state_pressed="true">
         <shape