Window Dialog Type change to TYPE_SYSTEM_ALERT (#307)

* add SYSTEM_ALERT_WINDOW permission to draw overlay

* TYPE_APPLICATION_OVERLAY - add type check

* add version check

* add import lib

* permission move to main app manifest

* set layoutparams

* add type - TYPE_SYSTEM_ALERT

* add  permission SYSTEM_ALERT_WINDOw

android/src/main/AndroidManifest.xml

 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.beefe.picker">
+      <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
 </manifest>

android/src/main/java/com/beefe/picker/PickerViewModule.java

@@ -360,8 +360,7 @@ public class PickerViewModule extends ReactContextBaseJavaModule implements Life
                 Window window = dialog.getWindow();
                 if (window != null) {
                     if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-                        layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
-                        window.setType(WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY);
+                        window.setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
                     }else{
                         if (MIUIUtils.isMIUI()) {
                             layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION;