Refactor to fix levelization:

* Remove Application & Database dependency in PerfLog. Replace it with
  a callback passed into the constructor.
* Fixes the circular dependency between ripple/nodestore and ripple/basics

src/ripple/app/main/Application.cpp

@@ -1339,8 +1339,6 @@ ApplicationImp::setup()
                 {
                     // Fall back to syncing from the network, such as
                     // when there's no existing data.
-                    if (startUp == Config::NETWORK && !config_->standalone())
-                        m_networkOPs->setNeedNetworkLedger();
                     startGenesisLedger();
                 }
                 else

src/ripple/perflog/impl/PerfLogImp.cpp

@@ -17,8 +17,9 @@
 */
 //==============================================================================
 
+#include <ripple/perflog/impl/PerfLogImp.h>
+
 #include <ripple/basics/BasicConfig.h>
-#include <ripple/basics/impl/PerfLogImp.h>
 #include <ripple/beast/core/CurrentThreadName.h>
 #include <ripple/beast/utility/Journal.h>
 #include <ripple/core/JobTypes.h>