General refactoring, using C++11

* Remove broken RecycledObjectPool

* Fix beast::ServiceQueue using List instead of LockFreeStack

* Add class semaphore, fixes broken Semaphore

* Move crytpo module files to new beast directory

* Use c++11 replacements for boost and beast types:
  - std::atomic instead of beast::Atomic
  - std::function instead of boost::function, beast::function
  - std::unique_ptr instead of beast::ScopedPointer
  - std::shared_ptr instead of boost::shared_ptr

* Remove modules:
  - beast_db
  - beast_crypto
  - beast_extras

* Remove unnecessary classes:
  - AbstractFifo
  - AddConst
  - AtomicCounter
  - AtomicFlag
  - AtomicPointer
  - AtomicState
  - CopyConst
  - Expression
  - ForwardList
  - IfCond
  - Interval
  - IntrusiveArray
  - KeyvaDB
  - PointerToOther
  - PointerTraits
  - RemoveConst
  - RemoveConstVolatile
  - RemoveReference
  - RemoveVolatile
  - SharedObjectArray
  - SingleThreadedSharedObject
  - SophiaDB factory
  - SortedSet
  - WeakReference
  - beast::unique_ptr

src/ripple/validators/impl/Logic.h

@@ -20,6 +20,8 @@
 #ifndef RIPPLE_VALIDATORS_LOGIC_H_INCLUDED
 #define RIPPLE_VALIDATORS_LOGIC_H_INCLUDED
 
+#include <memory>
+
 namespace ripple {
 namespace Validators {
 
@@ -158,7 +160,7 @@ public:
     {
         if (findSourceByID (source->uniqueID()))
         {
-            ScopedPointer <Source> object (source);
+            std::unique_ptr <Source> object (source);
             m_journal.error << "Duplicate " << source->name();
             return;
         }

src/ripple/validators/impl/SourceFile.cpp

@@ -89,10 +89,7 @@ private:
 
 SourceFile* SourceFile::New (File const& file)
 {
-    ScopedPointer <SourceFile> object (
-        new SourceFileImp (file));
-
-    return object.release ();
+    return new SourceFileImp (file);
 }
 
 }

src/ripple/validators/impl/SourceStrings.cpp

@@ -75,10 +75,7 @@ private:
 SourceStrings* SourceStrings::New (
     String name, StringArray const& strings)
 {
-    ScopedPointer <SourceStrings> object (
-        new SourceStringsImp (name, strings));
-
-    return object.release ();
+    return new SourceStringsImp (name, strings);
 }
 
 }

src/ripple/validators/impl/SourceURL.cpp

@@ -17,6 +17,8 @@
 */
 //==============================================================================
 
+#include <memory>
+
 namespace ripple {
 namespace Validators {
 
@@ -75,7 +77,7 @@ public:
 
 private:
     URL m_url;
-    ScopedPointer <HTTPClientBase> m_client;
+    std::unique_ptr <HTTPClientBase> m_client;
 };
 
 //------------------------------------------------------------------------------