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/protocol/STParsedJSON.h

@@ -20,6 +20,8 @@
 #ifndef RIPPLE_PROTOCOL_STPARSEDJSON_H_INCLUDED
 #define RIPPLE_PROTOCOL_STPARSEDJSON_H_INCLUDED
 
+#include <ripple/protocol/STArray.h>
+
 namespace ripple {
 
 /** Holds the serialized result of parsing an input JSON object.