[Fabric 1.21.4] Luminance 1.0.1

Perspective uniform now defaults to 0.0F. (legotaylor)
Added luminance:post/color_overlay shader. (legotaylor)
Updated silhouette shaders to use the color overlay shader. (legotaylor)
Added new uniform luminance_renderType, that returns the most appropriate rendertype for where the game currently is in its render loop (nettakrim)
Added uniforms for arbitrary effect duration and amplitude (presence can be checked by seeing if duration is anything other than 0 [-1 is infinite]), defaults to minecraft:speed. (nettakrim)