Ember Plus

...G...... [ZBXNEXT-9281] added configurable item timeout support

Merge in AP/ember-plus from feature/DEV-3917-7.0 to release/7.0

* commit '08fbb173eac5ad6ef0c5a462e1332cd406cf9ea2':
  .......... [DEV-3915] applied suggestion (doc)
  .......... [DEV-3915] applied suggestion (doc)
  .......... [DEV-3917] added readme and conf file changes
  .......... [DEV-3917] added changelog
  ...G...... [DEV-3917] moved timeout argument in handler signature, moved timeout calc-tion to the top of call stack
  .......... [DEV-3917] fixed style, fixed test
  ...G...... [ZBXNEXT-9281,DEV-3917] added per-item timeout support