[telecinco] Add extractor (closes #4005)

It uses the same extraction process as mitele.es, but with a few small differences.

youtube_dl/extractor/__init__.py

@@ -367,6 +367,7 @@ from .teachingchannel import TeachingChannelIE
 from .teamcoco import TeamcocoIE
 from .techtalks import TechTalksIE
 from .ted import TEDIE
+from .telecinco import TelecincoIE
 from .telemb import TeleMBIE
 from .tenplay import TenPlayIE
 from .testurl import TestURLIE