This PR adds the following methods to the `EventTarget` interface: 1. `addEventHandler` 2. `removeEventHandler` 3. `addEventFilter` 4. `removeEventFilter`
------------- Commit messages: - remove final modifier - remove final modifier - documentation changes - add final modifiers in Dialog class - revert some changes - doc changes - Promote addEventHandler/addEventFilter to EventTarget Changes: https://git.openjdk.org/jfx/pull/1090/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1090&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8306021 Stats: 584 lines in 13 files changed: 166 ins; 355 del; 63 mod Patch: https://git.openjdk.org/jfx/pull/1090.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1090/head:pull/1090 PR: https://git.openjdk.org/jfx/pull/1090
