beast cleanup and tidying:

* Replace custom types with C++11 <cstdint> types
* Fix sqlite integer intos and uses
* Fix String implicit integer constructors
* Escape the enclosing namespace in sqdb
* Replace contract checks with assert
* Make many header files compile independently
* Remove the dependence on beast_core.h in many places
* Remove unused or obsolete classes and functions
* Remove unused or obsolete macros
* Remove unused network functions and files
* Remove unused or obsolete classes:
  - ChildProcess
  - HighResolutionTimer
  - InterProcessLock
  - Throw
  - TrackedMutex
  - UntrackedMutex
  - XmlDocument
  - XmlElement

src/ripple/http/impl/Port.cpp

@@ -45,7 +45,7 @@ Port& Port::operator= (Port const& other)
 }
 
 Port::Port (
-    beast::uint16 port_,
+    std::uint16_t port_,
     beast::IP::Endpoint const& addr_,
     Security security_,
     beast::asio::SSLContext* context_)