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

modules/beast_core/threads/DynamicLibrary.h

@@ -34,7 +34,7 @@ namespace beast
     Since the DLL is freed when this object is deleted, it's handy for managing
     library lifetimes using RAII.
 */
-class BEAST_API DynamicLibrary : LeakChecked <DynamicLibrary>, public Uncopyable
+class DynamicLibrary : LeakChecked <DynamicLibrary>, public Uncopyable
 {
 public:
     /** Creates an unopened DynamicLibrary object.
@@ -77,6 +77,6 @@ private:
     void* handle;
 };
 
-}  // namespace beast
+} // beast
 
 #endif   // BEAST_DYNAMICLIBRARY_H_INCLUDED