Change PACKAGE name to Aseprite
Fix warning: Remove AL_CONST modifier from free_config_entries() function
Add support for Unicode file names on Windows

- Fixed issue #46: open .png files with Unicode chars
- Fixed issue #150: ability to uncompress program in folders w/Unicode chars
- Added base::utf8_iterator
- Added base::FileHandle
- Added base::get_app_path()
- Modified ui::KeyMessage::ascii() -> unicodeChar()
- Removed JI_NOTEXT flag
- Added app::XmlDocumentRef class and app::open_xml() function
- Added support for Unicode text exchange with Win32 clipboard
Merge branch 'dev' of git@github.com:dacap/aseprite.git into dev