Make many more utility classes/headers public. (#76)

Moving these headers from src to include enables other libraries to use the
functionality provided.

* tcpsockets
* atomic_static
* raw_istream
* timestamp
* SafeThread
* Base64
* LEB128
* ConcurrentQueue

The classes have been moved into the wpi namespace as they're generic.

src/tcpsockets/SocketError.cpp

@@ -5,7 +5,7 @@
 /* the project.                                                               */
 /*----------------------------------------------------------------------------*/
 
-#include "SocketError.h"
+#include "tcpsockets/SocketError.h"
 
 #ifdef _WIN32
 #include <windows.h>
@@ -13,7 +13,7 @@
 #include <string.h>
 #endif
 
-namespace tcpsockets {
+namespace wpi {
 
 std::string SocketStrerror(int code) {
 #ifdef _WIN32
@@ -28,4 +28,4 @@ std::string SocketStrerror(int code) {
 #endif
 }
 
-}  // namespace tcpsockets
+}  // namespace wpi