Added NzBuffer::SetStorage

Fixed (Index/Vertex)Buffer::(Fill/Map) not filling/mapping the entire
buffer when the third argument was zero
Fixed Renderer not accepting sequential index buffer

src/Nazara/Utility/VertexBuffer.cpp

@@ -120,6 +120,11 @@ void* NzVertexBuffer::Map(nzBufferAccess access, unsigned int offset, unsigned i
 	return m_buffer->Map(access, m_startVertex+offset, (length) ? length : m_vertexCount-offset);
 }
 
+bool NzVertexBuffer::SetStorage(nzBufferStorage storage)
+{
+	return m_buffer->SetStorage(storage);
+}
+
 bool NzVertexBuffer::Unmap()
 {
 	return m_buffer->Unmap();