v1.5.21

Features

• A new MovableFrame that allows repositioning Widgets when a specified key modifier is held.
• Text Layouts now have opacity and visible attributes, similar to Sprites.
• Add new shapes.Ellipse class.

Bugfixes

• Xlib - don't enable certain Window options if transparency is not enabled. (#454)
• Windows - Fix issue with some fonts where glyphs overhanging their advance would be cut off.