Remove RippleAddress:

The RippleAddress class was used to represent a number of fundamentally
different types: account public keys, account secret keys, node public
keys, node secret keys, seeds and generators.

The class is replaced by the following types:
* PublicKey for account and node public keys
* SecretKey for account and node private keys
* Generator for generating secp256k1 accounts
* Seed for account, node and generator seeds

src/ripple/app/misc/CanonicalTXSet.cpp

@@ -74,15 +74,26 @@ bool CanonicalTXSet::Key::operator>= (Key const& rhs)const
     return mTXid >= rhs.mTXid;
 }
 
+uint256 CanonicalTXSet::accountKey (AccountID const& account)
+{
+    uint256 ret = beast::zero;
+    memcpy (
+        ret.begin (),
+        account.begin (),
+        account.size ());
+    ret ^= mSetHash;
+    return ret;
+}
+
 void CanonicalTXSet::insert (std::shared_ptr<STTx const> const& txn)
 {
-    uint256 effectiveAccount = mSetHash;
-
-    effectiveAccount ^= to256 (txn->getAccountID(sfAccount));
-
-    mMap.insert (std::make_pair (
-                     Key (effectiveAccount, txn->getSequence (), txn->getTransactionID ()),
-                     txn));
+    mMap.insert (
+        std::make_pair (
+            Key (
+                accountKey (txn->getAccountID(sfAccount)),
+                txn->getSequence (),
+                txn->getTransactionID ()),
+            txn));
 }
 
 CanonicalTXSet::iterator CanonicalTXSet::erase (iterator const& it)