Add in-app privacy policy link to comply with Google Play policies

Also added Setup Guide and Troubleshooting Guide links too.

app/src/main/java/com/limelight/preferences/WebLauncherPreference.java

@@ -0,0 +1,45 @@
+package com.limelight.preferences;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.Build;
+import android.preference.Preference;
+import android.util.AttributeSet;
+
+import com.limelight.utils.HelpLauncher;
+
+public class WebLauncherPreference extends Preference {
+    private String url;
+
+    public WebLauncherPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        initialize(attrs);
+    }
+
+    public WebLauncherPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        initialize(attrs);
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public WebLauncherPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        initialize(attrs);
+    }
+
+    private void initialize(AttributeSet attrs) {
+        if (attrs == null) {
+            throw new IllegalStateException("WebLauncherPreference must have attributes!");
+        }
+
+        url = attrs.getAttributeValue(null, "url");
+        if (url == null) {
+            throw new IllegalStateException("WebLauncherPreference must have 'url' attribute!");
+        }
+    }
+
+    @Override
+    public void onClick() {
+        HelpLauncher.launchUrl(getContext(), url);
+    }
+}