Update EZUIStarterListener API
Changes:
- update EZUIStarterListener API: add frameDisplayed() method
- dropped down support of JDK 7; now JDK 8+ is required
Use of jGAF library: see https://github.com/pgdurand/jGAF-Tutorial/
Changes:
Use of jGAF library: see https://github.com/pgdurand/jGAF-Tutorial/