Adds retro-v2-softlight shader#181

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rbreaves wants to merge 5 commits intolibretro:masterfrom

rbreaves:retro-v2-softlight

Commits on Oct 13, 2022

Adds retro-v2-softlight shader
rbreaves
committed

Commits on Oct 14, 2022

Changes softlight shine to be more obvious, fixes aspect ratio & border glitch
rbreaves
committed

Commits on Oct 15, 2022

Adds MIT license for retro-v2 soft-light, also fixes border/aspect ratio
rbreaves
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retro-v2 softlight, further refinements to border & softlight gradations
rbreaves
committed

Commits on Oct 16, 2022

Adds retro-v2 softlight w/ image adjustments shader
rbreaves
committed