Simplify Beast:

* Remove asio HTTP classes
 * Remove beast::File, beast::String, beast::Stream, beast::Array,
   beast::MemoryBlock, beast::CriticalSection and other unused
   classes.
 * Remove unused platform-specific code.
 * Reduce Beast custom assert and debugging helper macros.

beast/utility/impl/Journal.cpp

@@ -18,6 +18,7 @@
 //==============================================================================
 
 #include <beast/utility/Journal.h>
+#include <cassert>
 
 namespace beast {
 
@@ -179,7 +180,7 @@ Journal::Stream::Stream (Sink& sink, Severity level, bool active)
     , m_level (level)
     , m_disabled (! active)
 {
-    bassert (level != kDisabled);
+    assert (level != kDisabled);
 }
 
 Journal::Stream::Stream (Stream const& stream, bool active)