Tidy up the structure of sources in protocol/:

Split out and rename STValidation
Split out and rename STBlob
Split out and rename STAccount
Split out STPathSet
Split STVector256 and move UintTypes to protocol/
Rename to STBase
Rename to STLedgerEntry
Rename to SOTemplate
Rename to STTx
Remove obsolete AgedHistory
Remove types.h and add missing includes
Remove unnecessary includes in app.h
Remove unnecessary includes in app.h
Remove include app.h from app1.cpp

src/ripple/protocol/STBase.h

@@ -0,0 +1,162 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_PROTOCOL_STBASE_H_INCLUDED
+#define RIPPLE_PROTOCOL_STBASE_H_INCLUDED
+
+#include <ripple/protocol/SField.h>
+#include <ripple/protocol/Serializer.h>
+#include <ostream>
+#include <string>
+#include <typeinfo>
+
+namespace ripple {
+
+// VFALCO TODO fix this restriction on copy assignment.
+//
+// CAUTION: Do not create a vector (or similar container) of any object derived
+// from STBase. Use Boost ptr_* containers. The copy assignment operator
+// of STBase has semantics that will cause contained types to change
+// their names when an object is deleted because copy assignment is used to
+// "slide down" the remaining types and this will not copy the field
+// name. Changing the copy assignment operator to copy the field name breaks the
+// use of copy assignment just to copy values, which is used in the transaction
+// engine code.
+
+//------------------------------------------------------------------------------
+
+/** A type which can be exported to a well known binary format.
+
+    A STBase:
+        - Always a field
+        - Can always go inside an eligible enclosing STBase
+            (such as STArray)
+        - Has a field name
+
+    Like JSON, a SerializedObject is a basket which has rules
+    on what it can hold.
+
+    @note "ST" stands for "Serialized Type."
+*/
+class STBase
+{
+public:
+    STBase();
+
+    explicit
+    STBase (SField::ref n);
+
+    virtual ~STBase() = default;
+
+    STBase& operator= (const STBase& t);
+
+    bool operator== (const STBase& t) const;
+    bool operator!= (const STBase& t) const;
+
+    template <class D>
+    D&
+    downcast()
+    {
+        D* ptr = dynamic_cast<D*> (this);
+        if (ptr == nullptr)
+            throw std::bad_cast();
+        return *ptr;
+    }
+
+    template <class D>
+    D const&
+    downcast() const
+    {
+        D const * ptr = dynamic_cast<D const*> (this);
+        if (ptr == nullptr)
+            throw std::bad_cast();
+        return *ptr;
+    }
+
+    virtual
+    SerializedTypeID
+    getSType() const;
+
+    virtual
+    std::string
+    getFullText() const;
+
+    virtual
+    std::string
+    getText() const;
+
+    virtual
+    Json::Value
+    getJson (int /*options*/) const;
+
+    virtual
+    void
+    add (Serializer& s) const;
+
+    virtual
+    bool
+    isEquivalent (STBase const& t) const;
+
+    virtual
+    bool
+    isDefault() const;
+
+    /** A STBase is a field.
+        This sets the name.
+    */
+    void
+    setFName (SField::ref n);
+
+    SField::ref
+    getFName() const;
+
+    std::unique_ptr<STBase>
+    clone() const;
+
+    void
+    addFieldID (Serializer& s) const;
+
+    static
+    std::unique_ptr <STBase>
+    deserialize (SField::ref name);
+
+protected:
+    SField::ptr fName;
+
+private:
+    // VFALCO TODO Return std::unique_ptr <STBase>
+    virtual
+    STBase*
+    duplicate() const
+    {
+        return new STBase (*fName);
+    }
+};
+
+//------------------------------------------------------------------------------
+
+STBase* new_clone (const STBase& s);
+
+void delete_clone (const STBase* s);
+
+std::ostream& operator<< (std::ostream& out, const STBase& t);
+
+} // ripple
+
+#endif