Replaced the sqlcipher database with a custom one

Still a WIP. This change was made to allow us to use Android's SecretKey API.
Which in turn allows us to store our secret keys in the Android KeyStore.

You can read about the database file format here: doc/db.md

app/src/main/java/me/impy/aegis/KeyProfile.java

@@ -1,7 +1,6 @@
 package me.impy.aegis;
 
 import java.io.Serializable;
-import java.security.Key;
 
 import me.impy.aegis.crypto.KeyInfo;
 
@@ -14,7 +13,6 @@ public class KeyProfile implements Serializable {
     public int Order;
     public int ID;
 
-
     public int compareTo(KeyProfile another) {
         if (this.Order>another.Order){
             return -1;