[WIP] 🔨 Refactoring

[Art4]

I'm creating this issue to note my refactoring plan and to document what has been done yet and what has to be done.

Todo

• Move functionality into single class, done with 🔨 Refactoring funcitonality into class #182
• Unit tests and PSR-4 autoloading, done with Introducing unit tests #188
• Parse streams into classes, see [Refactoring 🔨] Extracting StreamMap and VideoInfo #190 and Indroducing Stream class #220
• Config class to parse config files, see Move configuration to Config class #199
• Create Template engine to separate PHP and HTML, see Introducing template engine #214
• Create PSR-11 compatible Container to hold config, template engine and future modules, see Introducing Container class #222
• Create Application with Controllers to remove the logic from getvideo.php, download.php etc, see Create simple Application #224
• Release v0.1: https://github.com/jeckman/YouTube-Downloader/releases/tag/0.1
• Create PSR-16 compatible SimpleCache to store all kind of stuff, see Better file cache #239
• Create PSR-3 compatible Logger that can turn on for debugging, see New PSR-3 compatible Logger #248
• Create PSR-7 compatible HTTP client that will manage all HTTP calls, see New Http client #256
• Create simple plugin system for signature decipher Decrypt cypher signature #206, subtitles Is it possible to get subtitles for video? #217, etc

[Art4]

I think we are now ready for a first release v0.1
@jeckman With your permission I would push some changes to the CHANGELOG.md and tag the first release.

[jeckman]

Go for it - and thanks again for all your work on this project.

[Art4]

Thanks. You're welcome.

[Art4]

I just released 0.1 🎉
https://github.com/jeckman/YouTube-Downloader/releases/tag/0.1

[Art4]

I've created a Github project for this issue: https://github.com/jeckman/YouTube-Downloader/projects/1