Core 2.7.0 beta

• Added better bukkit task wrapper for manager classes.
• Added improved bukkit sound wrapper class.
• Added customizable number shortcuts. Now you can add your own aliases.
• Added support for compact number strings to parse them into double or int including Math#abs apply.
• Added command argument types that supports compact number inputs as well as regular numbers.
• Added dedicated 'colors.yml' config file to add custom colors or override default ones.
• Added better versions of all database related classes. Old versions are deprecated now.
• Added better ConfigValue methods to read and load Map objects.
• Added WeightedItem class.
• Added explicit implementations for the RankMap class.
• New PlaceholderList class to handle object related placeholders.
• New Replacer class to handle placeholder replacement in any string.
• Improved server version tests and notifications about possible issues/incompatibilities.
• Improved LangMessage placeholders replacement by using new Replacer class instead of applying direct string replacement.
• Improved ItemReplacer placeholders replacement by using new Replacer class instead.
• Merged nightcore commands into single class.
• Usage of Pair class is discouraged now and should be replaced with specific implementations.
• Getting players by their display name is discouraged now and should not be used anymore.
• Fixed minor issue with seconds formation.
• Fixed possible error when hide item attributes.
• Fixed userdata stuck in cache forver if player cancel connection when joining.
• Fixed GUI flicker caused by GUI title update.
• Removed useless and buggy options from the config file.