Typedoc - event plugin should not guessing an event owner

[psmyrek]

Suggested merge commit message (convention)

Other (typedoc-plugins): Changed the way events are defined. The value of the @eventName tag must be a valid identifier (link) to a class or an interface, to which given event should be attached. Closes ckeditor/ckeditor5#13553.

Other (typedoc-plugins): Extended the scope of the typedoc-plugin-event-inheritance-fixer plugin. So far only inherited events in classes and in the Observable interface have been checked. Now, support for inherited events has been added to all interfaces, so all derived classes and interfaces will contain all inherited events.

Feature (typedoc-plugins): Added support for multiple @eventName tags defined for one exported type. One exported type can now be used to create multiple events, even in different (not related to each other) classes or interfaces.

Internal (typedoc-plugins): Added all TypeDoc plugins (as paths to the plugin source) to the export from the package. This makes it easier to use them when creating a TypeDoc instance.

MAJOR BREAKING CHANGE (typedoc-plugins): Changed the way events are defined. Previously, the value from the @eventName tag was simply the name of the event and the typedoc-plugin-tag-event plugin was trying to guess which reflection should be the owner of this event. Now, the @eventName value must be a valid identifier (link) to the event owner, which can be a class or an interface, to which given event will be attached. The owner of every event must be explicitly defined. The identifier can be relative or absolute.

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Additional information

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[coveralls]

Coverage: 89.691%. Remained the same when pulling 7584e85 on ck/13553 into 2c124be on master.

[pomek]

LGTM.