Added

• UI: New UIBaseElement class, a clickable container base UI element (thanks @wpernath)
• UI: New UITextButton class, a clickable roundRect & Text base button (thanks @wpernath)

Changed

• Core: Build process will now only output a ES6 Bundle and the TS Declaration, ES5 is now fully deprecated
• Test Units: replaced the "old" ES5 based Jasmine+Karma framework by a modern ES6 based Mocha+Puppeteer one (thanks @L1lith)
• UI: the base GUI_Object class is now deprecated and replaced by UISpriteElement, a Sprite based clickable element

Fixed

• Build: fix typescript generation (d.ts), no more missing API or modules
• Container: fix Container class initialization when no default viewport have been created
• Core: fix a regression with Ejecta platform detection (following ES6 refactoring)