Added opacity handling.

~~Testing on the files you provided, it deserves the same interpretation as f_dc_0/1/2, so it's 0.5 + zeroth-order spherical harmonic coefficient * value. Looks reasonable, attaching screenshot.~~ (This was wrong, see further commit and comments)

Hint: Adding blending changes the look of everything, as pixels are not sorted anymore. If you want to disable alpha usage during display, you can always do it in Castle Model Viewer by toggling View -> Blending menu item.

https://vr.csgrid.org/gsplats/soaring_eagle.ply
https://ifiweb.informatik.tu-freiberg.de/public/silversplat/.%2Fmodels%2Fwerner_amethyst.ply
https://vr.csgrid.org/gsplats/Merrifield_100.ply
https://vr.csgrid.org/gsplats/Merrifield_fireplace.ply
https://vr.csgrid.org/gsplats/mug_space.ply

Uh oh!

Please handle opacity (alpha?) property in PLY files. #714

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