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/common/impl/MultiSocket.cpp

@@ -23,6 +23,8 @@
 
 #include "../../beast/beast/unit_test/suite.h"
 
+#include <cassert>
+
 namespace ripple {
 
 MultiSocket* MultiSocket::New (
@@ -234,7 +236,7 @@ public:
     template <typename Protocol>
     void testProxyFlags (int extraClientFlags, int extraServerFlags)
     {
-        check_precondition (! MultiSocket::Flag (extraClientFlags).any_set (
+        assert (! MultiSocket::Flag (extraClientFlags).any_set (
             MultiSocket::Flag::client_role | MultiSocket::Flag::server_role));
 
         runProxy <Protocol> (MultiSocket::Flag::client_role | extraClientFlags,
@@ -246,7 +248,7 @@ public:
     template <typename Protocol>
     void testFlags (int extraClientFlags, int extraServerFlags)
     {
-        check_precondition (! MultiSocket::Flag (extraClientFlags).any_set (
+        assert (! MultiSocket::Flag (extraClientFlags).any_set (
             MultiSocket::Flag::client_role | MultiSocket::Flag::server_role));
 
         run <Protocol> (MultiSocket::Flag::client_role | extraClientFlags,

src/ripple/common/impl/MultiSocketType.h

@@ -28,6 +28,8 @@
 
 #include "../../../beast/beast/cxx14/type_traits.h"
 
+#include <cassert>
+
 #ifndef RIPPLE_MULTISOCKET_NO_ALLOCATOR
 #define RIPPLE_MULTISOCKET_NO_ALLOCATOR 0
 #endif
@@ -387,7 +389,7 @@ protected:
     static Flag cleaned_flags (Flag flags)
     {
         // Can't set both client and server
-        check_precondition (! flags.set (
+        assert (! flags.set (
             Flag::client_role | Flag::server_role));
 
         if (flags.set (Flag::client_role))

src/ripple/common/impl/ResolverAsio.cpp

@@ -28,6 +28,8 @@
 
 #include "../ResolverAsio.h"
 
+#include <cassert>
+
 namespace ripple {
 
 class ResolverAsioImpl
@@ -81,8 +83,8 @@ public:
 
     ~ResolverAsioImpl ()
     {
-        check_precondition (m_work.empty ());
-        check_precondition (m_stopped);
+        assert (m_work.empty ());
+        assert (m_stopped);
     }
 
     //-------------------------------------------------------------------------
@@ -100,9 +102,9 @@ public:
 
     void start ()
     {
-        check_precondition (m_work.empty ());
-        check_precondition (m_stopped == true);
-        check_precondition (m_stop_called == false);
+        assert (m_work.empty ());
+        assert (m_stopped == true);
+        assert (m_stop_called == false);
 
         if (m_stopped.exchange (false) == true)
         {
@@ -136,9 +138,9 @@ public:
         std::vector <std::string> const& names,
         HandlerType const& handler)
     {
-        check_precondition (m_stop_called == false);
-        check_precondition (m_stopped == true);
-        check_precondition (!names.empty());
+        assert (m_stop_called == false);
+        assert (m_stopped == true);
+        assert (!names.empty());
 
         // TODO NIKB use rvalue references to construct and move
         //           reducing cost.
@@ -151,7 +153,7 @@ public:
     // Resolver
     void do_stop (CompletionCounter)
     {
-        check_precondition (m_stop_called == true);
+        assert (m_stop_called == true);
 
         if (m_stopped.exchange (true) == false)
         {
@@ -277,7 +279,7 @@ public:
     void do_resolve (std::vector <std::string> const& names,
         HandlerType const& handler, CompletionCounter)
     {
-        check_precondition (! names.empty());
+        assert (! names.empty());
 
         if (m_stop_called == false)
         {

src/ripple/common/impl/RippleSSLContext.cpp

@@ -19,8 +19,6 @@
 
 #include "../RippleSSLContext.h"
 
-#include "../../beast/modules/beast_core/beast_core.h"
-
 #include <cstdint>
 #include <sstream>