Added tapering line to GLUEParse MainMenu screen using low level core graphics APIs.

Create a layer "Layer A" with dimensions 150px × 10px
and fill it with a Gradient with:
lower color: #535e71 opacity: 33%
upper color: #535e71 opacity: 0%

Create a layer "Layer B" with dimensions 150px × 1px
and fill it with solid #535e71 opacity: 50%

Compose "Layer A" and "Layer B" together into "Layer C".
Apply reflected gradient mask from #ffffff to #000000 to "Layer C".

This produces the desired effect.