Remove libuv / simpler curl http

[ChristopherHX]

Why?

• Newer libcurl versions crashs or stuck at 0% while downloading
• libuv needs to be compiled from source in minecraft-linux build scripts, removing it make the build process simpler
• I didn't want to debug the complex http interface and why it doesn't work anymore.
• Failed http calls called the success handler, lead to unspecfic error reports during the past 2 years

What is changed?

• libuv dependency removed
• curl_muli replaced by curl_simple
• failed http requests due to network errors now contain a descriptive error message from curl
• public api no longer return a curl handle API CHANGE
• http_pool removed API CHANGE

I switched minecraft-linux to a fork of gplayapi, while there is a major problem with the orginal http code.