Made some inner classes static (For Efficiency)

(and made one explicitly private)

Closes #3932
// FREEBIE

src/org/thoughtcrime/securesms/DatabaseMigrationActivity.java

@@ -184,7 +184,7 @@ public class DatabaseMigrationActivity extends PassphraseRequiredActionBarActivi
     }
   }
 
-  private class NullReceiver extends BroadcastReceiver {
+  private static class NullReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
       abortBroadcast();

src/org/thoughtcrime/securesms/GroupMembersDialog.java

@@ -67,7 +67,7 @@ public class GroupMembersDialog extends AsyncTask<Void, Void, Recipients> {
     else                               onPostExecute(recipients);
   }
 
-  private class GroupMembersOnClickListener implements DialogInterface.OnClickListener {
+  private static class GroupMembersOnClickListener implements DialogInterface.OnClickListener {
     private final GroupMembers groupMembers;
     private final Context      context;
 

src/org/thoughtcrime/securesms/RegistrationProgressActivity.java

@@ -434,7 +434,7 @@ public class RegistrationProgressActivity extends BaseActionBarActivity {
     }
   }
 
-  private class RegistrationReceiver extends BroadcastReceiver {
+  private static class RegistrationReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
       abortBroadcast();

src/org/thoughtcrime/securesms/components/ThumbnailView.java

@@ -312,7 +312,7 @@ public class ThumbnailView extends FrameLayout {
     void onClick(View v, Slide slide);
   }
 
-  private class ThumbnailClickDispatcher implements View.OnClickListener {
+  private static class ThumbnailClickDispatcher implements View.OnClickListener {
     private ThumbnailClickListener listener;
     private Slide                  slide;
 

src/org/thoughtcrime/securesms/components/camera/CameraView.java

@@ -441,7 +441,7 @@ public class CameraView extends FrameLayout {
     ApplicationContext.getInstance(getContext()).getJobManager().add(job);
   }
 
-  private abstract class SerializedAsyncTask<Result> extends Job {
+  private static abstract class SerializedAsyncTask<Result> extends Job {
 
     public SerializedAsyncTask() {
       super(JobParameters.newBuilder().withGroupId(CameraView.class.getSimpleName()).create());

src/org/thoughtcrime/securesms/components/emoji/EmojiProvider.java

@@ -181,7 +181,7 @@ public class EmojiProvider {
     public void setColorFilter(ColorFilter cf) { }
   }
 
-  class DrawInfo {
+  private static class DrawInfo {
     EmojiPageBitmap page;
     int             index;
 

src/org/thoughtcrime/securesms/database/IdentityDatabase.java

@@ -142,7 +142,7 @@ public class IdentityDatabase extends Database {
     }
   }
 
-  public class Identity {
+  public static class Identity {
     private final Recipients  recipients;
     private final IdentityKey identityKey;
 

src/org/thoughtcrime/securesms/database/TextSecureDirectory.java

@@ -201,7 +201,7 @@ public class TextSecureDirectory {
     }
   }
 
-  private class DatabaseHelper extends SQLiteOpenHelper {
+  private static class DatabaseHelper extends SQLiteOpenHelper {
 
     public DatabaseHelper(Context context, String name,
                           SQLiteDatabase.CursorFactory factory,

src/org/thoughtcrime/securesms/database/loaders/CountryListLoader.java

@@ -38,7 +38,7 @@ public class CountryListLoader extends AsyncTaskLoader<ArrayList<Map<String, Str
     return results;
   }
 
-  private class RegionComparator implements Comparator<Map<String, String>> {
+  private static class RegionComparator implements Comparator<Map<String, String>> {
     @Override
     public int compare(Map<String, String> lhs, Map<String, String> rhs) {
       return lhs.get("country_name").compareTo(rhs.get("country_name"));

src/org/thoughtcrime/securesms/jobs/AttachmentDownloadJob.java

@@ -153,7 +153,7 @@ public class AttachmentDownloadJob extends MasterSecretJob implements Injectable
     }
   }
 
-  private class InvalidPartException extends Exception {
+  private static class InvalidPartException extends Exception {
     public InvalidPartException(Exception e) {super(e);}
   }
 

src/org/thoughtcrime/securesms/service/ApplicationMigrationService.java

@@ -183,7 +183,7 @@ public class ApplicationMigrationService extends Service
     }
   }
 
-  private class CompletedReceiver extends BroadcastReceiver {
+  private static class CompletedReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
       NotificationCompat.Builder builder = new NotificationCompat.Builder(context);

src/org/thoughtcrime/securesms/util/CharacterCalculator.java

@@ -20,7 +20,7 @@ public abstract class CharacterCalculator {
 
   public abstract CharacterState calculateCharacters(int charactersSpent);
 
-  public class CharacterState {
+  public static class CharacterState {
     public int charactersRemaining;
     public int messagesSpent;
     public int maxMessageSize;