Refactored adding new identities

- add deterministic identities
- import existing identities

app/src/main/AndroidManifest.xml

@@ -18,7 +18,8 @@
         android:allowBackup="false"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
-        android:theme="@style/AppTheme">
+        android:theme="@style/AppTheme"
+        tools:replace="android:allowBackup">
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name">
@@ -103,6 +104,26 @@
                 <category android:name="android.intent.category.BROWSABLE"/>
             </intent-filter>
         </activity>
+        <activity
+            android:name=".ImportIdentityActivity"
+            android:label="@string/title_import_identity"
+            android:parentActivityName=".MainActivity">
+            <meta-data
+                android:name="android.support.PARENT_ACTIVITY"
+                android:value=".MainActivity"/>
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW"/>
+
+                <data
+                    android:host="*"
+                    android:mimeType="*/*"
+                    android:pathPattern=".*\\.dat"
+                    android:scheme="file"/>
+
+                <category android:name="android.intent.category.DEFAULT"/>
+                <category android:name="android.intent.category.BROWSABLE"/>
+            </intent-filter>
+        </activity>
 
         <service android:name=".service.BitmessageService"/>
         <service android:name=".service.ProofOfWorkService"/>