[Scaler][Agar][SDLFB] Add x1.25 scaler, useful for 800x[500|600] mode.
[Draw][Scaler] Add x2.5 scaler. Useful for 800x[500|600] with 320 mode.
[Agar][Scaler][SDLFB] Add x5 , x4.5 Scaler, useful for 320 mode.