Separate NAZARA_API into multiple defines (one per module)

To fix inter-module dependency


Former-commit-id: 64704f020e0af22e529d38527323ba977187d4d0

include/Nazara/Core/MemoryStream.hpp

@@ -10,7 +10,7 @@
 #include <Nazara/Prerequesites.hpp>
 #include <Nazara/Core/InputStream.hpp>
 
-class NAZARA_API NzMemoryStream : public NzInputStream
+class NAZARA_CORE_API NzMemoryStream : public NzInputStream
 {
 	public:
 		NzMemoryStream(const void* ptr, nzUInt64 size);