plugins.tv4play: Add support for fotbollskanalen.se.
plugin.api.validate: Add support for URL validation.
plugin.api.validate: Add support for regex match to get().
plugin.api.http_session: Add schema keyword argument.
plugin.api.validate: Add startswith and endswith.
plugin: Import Options.
plugins.drdk: Handle videos without episode name in URL.

Resolves #424.
plugin.api.validate: Handle more key validation in dicts.
Add plugin for dommune.com.
plugins.cast3d: Remove since service no longer exists.
plugins.hashd: Remove since service no longer exists.
plugins.speedrunslive: Minor tweak.
plugins.alieztv: Refactor to use the validation API.

Also add support for videos.
plugins.bambuser: Refactor to use the validation API.
plugins.chaturbate: Refactor to use the validation API.
plugins.crunchyroll: Refactor to use the validation API.
plugins.euronews: Refactor to use the validation API.

Also add support for videos and no longer fetch the livestream
on the root URL, now requires an actual URL to a live stream,
such as "http://euronews.com/news/streaming-live/".
plugins.furstream: Refactor to use the validation API.
plugins.nrk: Refactor to use the validation API.
plugins.oldlivestream: Minor tweaks.