issue #8988: Adds new enum types (LEFT_CTRL, RIGHT_CTRL, LEFT_ALT, RIGHT_ALT, LEFT_SHIFT, RIGHT_SHIFT) in EventKeyboard::KeyCode.
Merge pull request #9241 from dumganhar/iss8988-left-ctrl

issue #8988: Adds new enum types (LEFT_CTRL, RIGHT_CTRL, LEFT_ALT, RIGHTALT, LEFT_SHIFT, RIGHT_SHIFT) in EventKeyboard::KeyCode.