Merge waqas with Tobias. Eww.

Removed util/discohelper.lua

Removed core/discomanager.lua

modulemanager: Removed unused variables and reference to core.discomanager

modulemanager: Removed unnecessary code in the unload function

modulemanager: Removed legacy disco#items hook

modulemanager: add_feature and add_identity APIs updated to use only the add_item API

componentmanager: Removed disco#items hook, and reference to core.discomanager

mod_disco: Rearranged some lines, and added a FIXME comment

mod_disco: Removed reference to core.discomanager

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