2.7.1

fixes issue with future potential plugin incompatibility from changes made in 2.7.0.

Removes injector system completely.

There are a ton of plugins available which handle showing placeholder values where you want to have them shown. Practically anywhere text related. I feel at this point, the injectors are hardly used and shouldn't be needed due to how many plugins offer support for PlaceholderAPI.

Adds function which gives expansions the ability to implement Listener. This will allow expansion developers ability to create placeholders or gather data for placeholders by listening to events