More sophisticated scalers and scandoublers

[sy2002]

Conversation on Discord: https://discord.com/channels/719326990221574164/794775503818588200/1289180423771127879

Step 1) When not using the polyphase scaler (which is used when the scanline emulation is being switched on), then the HDMI scaler we use supports Nearest Neighbour, Bilinear, Sharp Bilinear, Bicubic. Currently we only support Nearest Neighbour so a quick win would be to support the other options: Bilinear, Sharp Bilinear, Bicubic

Step 2) See Viper's comment on Discord:
https://discord.com/channels/719326990221574164/794775503818588200/1289607591718031411