Modernize base_uint:

*  Add construction and assignment from a generic
   contiguous container.  Both compile-time and run time
   safety checks are made to ensure the safety of this
   conversion.

*  Remove base_uint::copyFrom.  The generic copy assignment
   operator now does this functionality with enhanced
   safety and better syntax.

*  Remove construction from and dedendence on Blob.
   The generic constructor and assignment now handle this
   functionality.

*  Fix client code to adhere to this new API.

*  Removed the use of fromVoid in PeerImp.cpp as it was
   an inappropriate use of this dangerous API.  The
   generic container constructors do it with enhanced
   safety and better syntax.

*  Rename data member pn to data_ and make it private.

*  Remove constraint from hash_append

*  Remove array_type alias

src/ripple/protocol/impl/AccountID.cpp

@@ -148,7 +148,7 @@ calcAccountID (PublicKey const& pk)
 AccountID const&
 xrpAccount()
 {
-    static AccountID const account(0);
+    static AccountID const account(beast::zero);
     return account;
 }
 

src/ripple/protocol/impl/STAccount.cpp

@@ -60,9 +60,9 @@ STAccount::STAccount (SerialIter& sit, SField const& name)
 
 STAccount::STAccount (SField const& n, AccountID const& v)
     : STBase (n)
+    , value_(v)
     , default_ (false)
 {
-    value_.copyFrom (v);
 }
 
 std::string STAccount::getText () const

src/ripple/protocol/impl/STAmount.cpp

@@ -106,12 +106,12 @@ STAmount::STAmount(SerialIter& sit, SField const& name)
     }
 
     Issue issue;
-    issue.currency.copyFrom (sit.get160 ());
+    issue.currency = sit.get160();
 
     if (isXRP (issue.currency))
         Throw<std::runtime_error> ("invalid native currency");
 
-    issue.account.copyFrom (sit.get160 ());
+    issue.account = sit.get160();
 
     if (isXRP (issue.account))
         Throw<std::runtime_error> ("invalid native account");

src/ripple/protocol/impl/STPathSet.cpp

@@ -91,13 +91,13 @@ STPathSet::STPathSet (SerialIter& sit, SField const& name)
             AccountID issuer;
 
             if (hasAccount)
-                account.copyFrom (sit.get160 ());
+                account = sit.get160();
 
             if (hasCurrency)
-                currency.copyFrom (sit.get160 ());
+                currency = sit.get160();
 
             if (hasIssuer)
-                issuer.copyFrom (sit.get160 ());
+                issuer = sit.get160();
 
             path.emplace_back (account, currency, issuer, hasCurrency);
         }

src/ripple/protocol/impl/UintTypes.cpp

@@ -110,7 +110,7 @@ Currency to_currency(std::string const& code)
 
 Currency const& xrpCurrency()
 {
-    static Currency const currency(0);
+    static Currency const currency(beast::zero);
     return currency;
 }