SwitchTrans

Maybe due to the change of Vitis version to 2023.2, I found that the routing of the design becomes quite difficult and ended up with a malfuntioning binary. Hence, I decided to change Lbuffer to SwitchTrans, that will embed the transpose operation into butterfly operations, to make it more easier to route. Although this will cause the divergence from the paper's architecture, I believe that a reproducible working implementation is better for everyone.