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. (It will work on me anyway!)

There are no breaking changes; except for the removal of non-important documentation and the addition of much currently-omitted documentation.