jsdoc core/plugins

Added support for PIXI documentation filtering - hides the "interactive"-related PIXI documentation from the generated (Sprite, eg.) classes. This includes things like defaultCursor, tap, and mousedown which are not used/supported in Phaser.

Added the namealias plugin which alters documentation comments so that jsdoc can gather more relevant information (without altering the current Phaser documentation format) - without this change there are many properties (eg. in Game) defined in constructors that are not correctly shown in output.

Added a short/friendly link plugin so {@link #member} can be used for intratype links. This is much more sane then repeated expansion of {@link Phaser.SomeClass#member member} and will hopefully encourage the use of more local links.

There are no breaking changes; except for the removal of non-important documentation and the addition of much currently-omitted documentation.