2.0.0-beta-1

Total refactoring

Breaking

• remove ReadonlyEvent
• swap Sender and Arg argument position
• no throw exception on emit

Features

• Event for(filter)-method
• Event options:
  • source - source for an event (readonly event alternative)
  • bail - event reaction on any listener error
  • filter - event only emit if an argument passes a filter

see README.md for examples