Direct screenwavemedia.com URLs support (issue #3766)

The first patch adds support for direct downloading from screenwavemedia.com URLs (by modifying the cinemassacre extractor). The second adds teamfourstar.com support on top of it.

**Warning**: the patches were not tested very well, and probably should not be accepted without review; I feel the code is quite inefficient with its multiple URL parsing and may not cover some corner cases.
This code is not required anymore (it used to - where did you still find it) - `_real_extract` only gets called when th eURL is suitable, and being suitable is defined as `re.match(self._VALID_URL, url)`.