Add "Output Resampling" option (#1541)

Adds an Output Resampling option to the Video tab to allow choosing between the old Bilinear sampler and a new Area sampler. Area sampling produces a much cleaner, softer image when downscaling, and a significantly sharper image when upscaling. This can also serve as a halfway decent anti-aliasing substitute until we have a more proper implementation.

src/dusk/config.cpp

@@ -176,6 +176,7 @@ namespace dusk::config {
     template class ConfigImpl<dusk::GameLanguage>;
     template class ConfigImpl<dusk::GyroMode>;
     template class ConfigImpl<dusk::FrameInterpMode>;
+    template class ConfigImpl<dusk::Resampler>;
 }
 
 void dusk::config::Register(ConfigVarBase& configVar) {