Upload urls and regexps from github

[Maledictus]

I think we should create some settings file, which we will download from github to app each start. In this file will be all comics urls and comics regeps. It will give us a possibility to fix comics without releasing new version of app

[Maledictus]

@tardypad I created working poc for this and merged it to master. I checked it for some broken comics and all works fine.
Notice: github updates raw content every 5 minutes so all changes in update.json start working in 5 minutes after commit.

[Olf0]

I assume this was successfully addressed by commit babc88c on 2019-08-21 or by its parent, commit d500a76 also on 2019-08-21. This established the plugins/update.json file.

Hence this issue can be closed.