update services

[xDashh]

Add support for

- [ ] steam.tv

• [x] mixer.com

Drop support for

• [x] Afreeca
• [x] Dailymotion
• [x] Chaturbate (unused and bad embed support)

Reminder to add autoplay/chat to the embed, if it isn't by default:

• [x] See/Update https://github.com/MemeLabs/Rustla2/wiki/Updating-Functionality/

[jbpratt]

Notes for later, or someone else.

Mixer

• https://mixer.com/embed/player/MAGNETRON?disableLowLatency=1
• https://mixer.com/embed/chat/MAGNETRON

Steam.tv

will search more later for embed links

(Update): Steam.tv is being put off (temporarily?) due to the nature of the website

[xDashh]

Ustream doesn't seem to have chat anymore (could be removed). Have to check in more detail.