Fix wrong ARGB1555 constant

• Fix wrong ARGB1555 constant (Thanks @dinoghi)

Add triangles and image overlays

• Added support for drawing triangles and image overlays

Add Progressbar Support

Add support for progressbar widget including a new example sketch.

Audio Playback

Adds support for audio playback including a new example sketch.

This release also includes the option to transfer data to the general purpose graphics RAM from RAM instead of flash memory for AVR architectures.

Add Scrollbar Support

Add support for scrollbars including a new example sketch.

Structural Changes

This release has only structural changes to how the library's files are organized with its main purpose to accommodate the official Arduino specs.

First Official Release

This release is compatible with boards starting from REV2007E.