* Made spot size parameters adjustable also increased samples from 2 to 3 scanlines for crt-geom-deluxe.
* Made horizontal interpolation adjustable.
* bgfx crt-geom-deluxe: Made phosphor decay smoothly to zero at specified cutoff time.
* bgfx crt-geom-deluxe: Added lowpass filter.
This includes several aperture grille / shadow mask patterns. Note that these are all designed to be used on a display with RGB subpixel order, and may thus suffer if rotated or used with a BGR display.