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/validators/impl/Manager.cpp

@@ -283,7 +283,7 @@ public:
     {
         Context::Scope scope (m_context);
 
-        map ["trusted"] = beast::uint32 (
+        map ["trusted"] = std::uint32_t (
             m_logic.m_chosenList ?
                 m_logic.m_chosenList->size() : 0);