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/Memory.h

@@ -78,7 +78,7 @@ Type* createCopyIfNotNull (const Type* pointer)
  /** A handy C++ wrapper that creates and deletes an NSAutoreleasePool object using RAII.
      You should use the BEAST_AUTORELEASEPOOL macro to create a local auto-release pool on the stack.
  */
- class BEAST_API ScopedAutoReleasePool : public Uncopyable
+ class ScopedAutoReleasePool : public Uncopyable
  {
  public:
      ScopedAutoReleasePool();