Pyglet

Features
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- 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
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- 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.

Features
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- Experimental support for transparent and overlay windows on Linux and Windows.
- Shapes - Allow rotation and changing of border color for the BorderedRectangle.

Bugfixes
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- Xlib - Fix the mouse Y position being off by 1-pixel.
- Windows - Fix gapless audio playback on the XAudio2 backend.

Bugfixes
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- If XAudio2 device creation fails, catch exception so that the next driver can be tried.
- Fix dangling file pointers in GStreamer decoder.
- Expose font.name attribute to show the font family name.
- Un-associate queued Source from a deleted Player instance (256)
- Fix circular import when trying to create a Windows in 'headless' mode.
- Un-associate StreamingSources from deleted Player instances (256)
- Update pypng lib to avoid deprecated functions (405)

Bugfixes
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- FFmpeg decoder add FF_INPUT_BUFFER_PADDING_SIZE to buffers.
- Add missing DI8DEVTYPE_SUPPLEMENTAL joystick device type.
- Fix bool clamping causing crash with DirectWrite text decoder.

Maintenance
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- Change IncrementalTextLayout to use glScissor instead of glClipPlane.
- Raise warning on Window creation if the GPU drivers do not support OpenGL 2.0

Features
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- Add a new `shapes.Star` shape.

Bugfixes
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- 3d model obj decoder supports multiple material types
- Fix GStreamerSources not being garbage collected 283
- Fix ScrollableTextLayout not respecting anchors/alignment.

Features
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- New DirectWrite based font loader. Enable with `pyglet.options["advanced_font_features"] = True`
- Add `position` property to Text Layouts, to mimic other classes.

Bugfix and maintenance release

Bugfixes
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- shapes.Circle segment calculation will always use a minimum of 14 segments.
- shapes.Arc is now made from line segments, and by default has unconnected ends.
- Windows - Use the internal keystate to determine the mod shift rather than relying on GetKeyState
which relies on another event that may be called after WM_INPUT.

Maintenance
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- Various Headless backend and EGL work.