Support improved syntax for all effects in editor.py

[tburrows13]

• I have properly documented unusual changes to the code in the comments around it

Previously, certain effects were being added as methods to VideoClips and AudioClips. This makes the syntax for using them much easier, however, not all effects were included in this. Seeing as the list of effects are already generated in moviepy/video/fx/all/__init__.py and moviepy/audio/fx/all/__init__.py (imported into editor.py as vfx and afx respectively), it made sense to instead use these lists instead.

Note that there is no such list for transfx (which are just the contents of moviepy/video/compositing/transitions.py so this is still just manually implemented).

[coveralls]

Coverage increased (+0.05%) to 64.734% when pulling f544085 on tburrows13:update-fx-list into 98c73cd on Zulko:master.

[mgaitan]

@tburrows13 I totally agree this is a much simpler API than my "class based" idea. What I really don't like is the implementation.

IMHO we should try to get rid off the editor.py module, and do "the magic" directly in the classes, using proper metaprogramming tools that python offers, instead the nasty and dangerous exec monkeypatching.

In this way, in addition to be more "pythonic", we could do just from moviepy import VideoClip and that would be enough to have the full featured class.

If you like, I could do a PoC. Meanwhile, you could close #1096 and any other related ticket.

[mgaitan]

Please check #1105 for a simple refactor proposal based on this one

[tburrows13]

Closing in favour of #1105