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

beast/utility/StaticObject.h

@@ -98,7 +98,7 @@ private:
 
         static StaticData& get ()
         {
-            static uint8 storage [sizeof (StaticData)];
+            static std::uint8_t storage [sizeof (StaticData)];
             return *(reinterpret_cast <StaticData*> (&storage [0]));
         }