wrap all library code into namespace if VCMI_LIB_NAMESPACE is defined

preparation for having client and server in a single process

lib/filesystem/CMemoryBuffer.cpp

@@ -11,6 +11,8 @@
 #include "StdInc.h"
 #include "CMemoryBuffer.h"
 
+VCMI_LIB_NAMESPACE_BEGIN
+
 ///CMemoryBuffer
 CMemoryBuffer::CMemoryBuffer():
 	position(0)
@@ -71,3 +73,5 @@ si64 CMemoryBuffer::getSize()
 }
 
 
+
+VCMI_LIB_NAMESPACE_END