Update glitch.js to version 2.0

+ Multiple variations of glitch colours, allows for a more awesome effect.
+ Added the ability for glitch.js to distort multiple objects.
+ Added distort_only_text_inside_distort_objects, which is self-explanatory.
- Removed glitch shapes which required CSS and didn't work very well.
- Removed 'distort_text_multicolour' which allowed different text on the screen to be distorted in different colours, this looks 'more trippy than glitchy' and needed to be removed to allow multiple colour variations.