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/native/linux_Threads.cpp

@@ -68,7 +68,7 @@ bool beast_isRunningUnderDebugger()
     return testResult < 0;
 }
 
-BEAST_API bool BEAST_CALLTYPE Process::isRunningUnderDebugger()
+bool Process::isRunningUnderDebugger()
 {
     return beast_isRunningUnderDebugger();
 }
@@ -82,4 +82,4 @@ static void swapUserAndEffectiveUser()
 void Process::raisePrivilege()  { if (geteuid() != 0 && getuid() == 0) swapUserAndEffectiveUser(); }
 void Process::lowerPrivilege()  { if (geteuid() == 0 && getuid() != 0) swapUserAndEffectiveUser(); }
 
-}  // namespace beast
+} // beast