OptiFine Internal Shaders Related

Removes darkening on sides of geometry, inspired by the old lighting from OptiFine's internal shaders, for in-game blocks, clouds, and (block) entities.

Adds a video setting to make block lighting flatter.

No shading for world and inventory forms of luminous objects.

Renders Totem of Undying items at full brightness, that is, unaffected by lighting and directional shading.