Pyxel

- Changed the properties of the Sound class to public
- Added offset arguments to the Image load method
- Added the copy method to the Image class
- Renamed arguments of the image and sound API
- Added the window icon
- Added the logo API
- Added the resize method to the Image class
- Refined Example 1-4

- Added the version number constant
- Renamed the examples copy script to install_pyxel_examples
- Removed unnecessary scripts
- Separated the constant definitions
- Added the image API and renamed related APIs
- Added the sound API and renamed related APIs

- Changed the key assigns of the special inputs
- Added the screen capture functions (still image and video)
- Included the examples in the package and added the copy script
- Added the fromstring method to the Image class
- Added the fromstring method to the Sound class

- Added the '-'(flat) syntax to the Sound class
- Added the set method to the Image class again
- Renamed the track to channel
- Changed the play API to enable to play a sound list

- Added the audio playback function
- Removed the set method of the Image class

- First alpha release