v4.0-release

Added

• multiplayer support
• AchievementAPI.registerAll method
• title of groups translation support
• connection & announce property in IAchievement
• more information in exceptions
• other new methods

Changed

• header & copyright
• name of properties in IAchievement:
  • unique -> uid
  • strongDependence -> hidden
  • notCompletePopup -> showPopup
• name of properties in IAchievementGroup:
  • unique -> uid
  • bgTexture -> background
• AchievementGroup.addChildren renamed to addChild
• new format for name, description & parent
• item property renamed to icon and it can be set to the item id
• get and set properties instead of regular methods
• Translation keys
• UI moved to another class - AchievementsUI
• Some of Achievement methods moved to AchievementData
• ui textures dir refactor
• moved window show button to pause menu
• commands can accept the player's name as the last parameter
• popup window cannot be clicked

Fixed

• popup stays on the screen after left the world
• JSDoc in IAchievementGroup.background
• window title

Removed

• onAchieve callback
• methods from AchievementAPI: getLocalized, giveAllForGroup, removeDataFor, getProgress