Major storage layer refactoring to set the stage for clean GCM.

1) We now try to hand out cursors at a minimum.  There has always been
   a fairly clean insertion layer that handles encrypting message bodies,
   but the process of decrypting message bodies has always been less than
   ideal.  Here we introduce a "Reader" interface that will decrypt message
   bodies when appropriate and return objects that encapsulate record state.

   No more MessageDisplayHelper.  The MmsSmsDatabase interface is also more
   sane.

2) We finally rid ourselves of the technical debt associated with TextSecure's
   initial usage of the default SMS DB.  In that world, we weren't able to use
   anything other than the default "Inbox, Outbox, Sent" types to describe a
   message, and had to overload the message content itself with a set of
   local "prefixes" to describe what it was (encrypted, asymetric encrypted,
   remote encrypted, a key exchange, procssed key exchange), and so on.

   This includes a major schema update that transforms the "type" field into
   a bitmask that describes everything that used to be encoded in a prefix,
   and prefixes have been completely eliminated from the system.

   No more Prefix.java

3) Refactoring of the MultipartMessageHandler code.  It's less of a mess, and
   hopefully more clear as to what's going on.

The next step is to remove what we can from SmsTransportDetails and genericize
that interface for a GCM equivalent.

src/org/thoughtcrime/securesms/sms/IncomingTextMessage.java

@@ -0,0 +1,144 @@
+package org.thoughtcrime.securesms.sms;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.telephony.SmsMessage;
+
+import org.thoughtcrime.securesms.gcm.IncomingGcmMessage;
+
+import java.util.List;
+
+public class IncomingTextMessage implements Parcelable {
+
+  public static final Parcelable.Creator<IncomingTextMessage> CREATOR = new Parcelable.Creator<IncomingTextMessage>() {
+    @Override
+    public IncomingTextMessage createFromParcel(Parcel in) {
+      return new IncomingTextMessage(in);
+    }
+
+    @Override
+    public IncomingTextMessage[] newArray(int size) {
+      return new IncomingTextMessage[size];
+    }
+  };
+
+  private final String  message;
+  private final String  sender;
+  private final int     protocol;
+  private final String  serviceCenterAddress;
+  private final boolean replyPathPresent;
+  private final String  pseudoSubject;
+  private final long    sentTimestampMillis;
+
+  public IncomingTextMessage(SmsMessage message) {
+    this.message              = message.getDisplayMessageBody();
+    this.sender               = message.getDisplayOriginatingAddress();
+    this.protocol             = message.getProtocolIdentifier();
+    this.serviceCenterAddress = message.getServiceCenterAddress();
+    this.replyPathPresent     = message.isReplyPathPresent();
+    this.pseudoSubject        = message.getPseudoSubject();
+    this.sentTimestampMillis  = message.getTimestampMillis();
+  }
+
+  public IncomingTextMessage(IncomingGcmMessage message) {
+    this.message              = message.getMessageText();
+    this.sender               = message.getSource();
+    this.protocol             = 31337;
+    this.serviceCenterAddress = "GCM";
+    this.replyPathPresent     = true;
+    this.pseudoSubject        = "";
+    this.sentTimestampMillis  = message.getTimestampMillis();
+  }
+
+  public IncomingTextMessage(Parcel in) {
+    this.message              = in.readString();
+    this.sender               = in.readString();
+    this.protocol             = in.readInt();
+    this.serviceCenterAddress = in.readString();
+    this.replyPathPresent     = (in.readInt() == 1);
+    this.pseudoSubject        = in.readString();
+    this.sentTimestampMillis  = in.readLong();
+  }
+
+  public IncomingTextMessage(IncomingTextMessage base, String newBody) {
+    this.message              = newBody;
+    this.sender               = base.getSender();
+    this.protocol             = base.getProtocol();
+    this.serviceCenterAddress = base.getServiceCenterAddress();
+    this.replyPathPresent     = base.isReplyPathPresent();
+    this.pseudoSubject        = base.getPseudoSubject();
+    this.sentTimestampMillis  = base.getSentTimestampMillis();
+  }
+
+  public IncomingTextMessage(List<IncomingTextMessage> fragments) {
+    StringBuilder body = new StringBuilder();
+
+    for (IncomingTextMessage message : fragments) {
+      body.append(message.getMessageBody());
+    }
+
+    this.message              = body.toString();
+    this.sender               = fragments.get(0).getSender();
+    this.protocol             = fragments.get(0).getProtocol();
+    this.serviceCenterAddress = fragments.get(0).getServiceCenterAddress();
+    this.replyPathPresent     = fragments.get(0).isReplyPathPresent();
+    this.pseudoSubject        = fragments.get(0).getPseudoSubject();
+    this.sentTimestampMillis  = fragments.get(0).getSentTimestampMillis();
+  }
+
+  public long getSentTimestampMillis() {
+    return sentTimestampMillis;
+  }
+
+  public String getPseudoSubject() {
+    return pseudoSubject;
+  }
+
+  public String getMessageBody() {
+    return message;
+  }
+
+  public IncomingTextMessage withMessageBody(String message) {
+    return new IncomingTextMessage(this, message);
+  }
+
+  public String getSender() {
+    return sender;
+  }
+
+  public int getProtocol() {
+    return protocol;
+  }
+
+  public String getServiceCenterAddress() {
+    return serviceCenterAddress;
+  }
+
+  public boolean isReplyPathPresent() {
+    return replyPathPresent;
+  }
+
+  public boolean isKeyExchange() {
+    return false;
+  }
+
+  public boolean isSecureMessage() {
+    return false;
+  }
+
+  @Override
+  public int describeContents() {
+    return 0;
+  }
+
+  @Override
+  public void writeToParcel(Parcel out, int flags) {
+    out.writeString(message);
+    out.writeString(sender);
+    out.writeInt(protocol);
+    out.writeString(serviceCenterAddress);
+    out.writeInt(replyPathPresent ? 1 : 0);
+    out.writeString(pseudoSubject);
+    out.writeLong(sentTimestampMillis);
+  }
+}