Tidy up includes and add modules to the classic build:

An alternative to the unity build, the classic build compiles each
translation unit individually. This adds more modules to the classic build:

* Remove unity header app.h
* Add missing includes as needed
* Remove obsolete NodeStore backend code
* Add app/, core/, crypto/, json/, net/, overlay/, peerfinder/ to classic build

src/ripple/app/main/LocalCredentials.cpp

@@ -17,14 +17,19 @@
 */
 //==============================================================================
 
+#include <BeastConfig.h>
+#include <ripple/app/data/DatabaseCon.h>
+#include <ripple/app/main/Application.h>
+#include <ripple/app/main/LocalCredentials.h>
+#include <ripple/app/peers/UniqueNodeList.h>
+#include <ripple/basics/Log.h>
 #include <ripple/basics/StringUtilities.h>
 #include <ripple/basics/make_SSLContext.h>
 #include <ripple/core/Config.h>
+#include <iostream>
 
 namespace ripple {
 
-LocalCredentials::LocalCredentials () = default;
-
 void LocalCredentials::start ()
 {
     // We need our node identity before we begin networking.