Make API work with an already running event loop

[crazygmr101]

Related #123
Related #115 ?

Uses a separate thread to run the event loop for TikTokApi, since only one event loop can be ran at a time. This allows the Api to be used in applications that already use the event loop, i.e. Discord bots

[crazygmr101]

Note, the library is still mainly sync in how it's called - a bit of a rewrite would be required to change that

[crazygmr101]

Looks like this also might fix #146

[davidteather]

Travis is failing probably because the loop is never closed

[crazygmr101]

Travis is failing probably because the loop is never closed

Fair point, I'm on the way to work but I can fix that later tonight then

[crazygmr101]

Waiting on 955e906 - 65cb4fd passed but didn't actually let me close the loop in my bot

[davidteather]

I resolved conflicts in #232 sorry it took me so long to test.