Better disabling of updater
Move the check to the updater.sh script. This way it won't spam with fake error saying that the updater is disabled (which is problematic, but the user asked for it). Also, it is a bit less hacky and the user is able to update manually when requested.
The „target“ branch is chosen so the correct diff is show, since I had to base it on top of other branch.
This is for #107 (closed).