Move Ext.define() default values also to tag classes.

    # given cls Hash

    def detect_ext_define(cls, ast)

      # defaults

      cls[:extends] = "Ext.Base"

      cls[:requires] = []

      cls[:uses] = []

      cls[:alternateClassNames] = []

      cls[:mixins] = []

      cls[:aliases] = []

      cls.merge!(BuiltinsRegistry.ext_define_defaults)

      cls[:members] = []

      cls[:code_type] = :ext_define

    def initialize

      @pattern = "alias"

      @ext_define_pattern = "alias"

      @ext_define_default = {:aliases => []}

    end

    # For backwards compatibility decide whether the @alias was used

    def initialize

      @pattern = ["alternateClassName", "alternateClassNames"]

      @ext_define_pattern = "alternateClassName"

      @ext_define_default = {:alternateClassNames => []}

    end

    # @alternateClassNames classname1 classname2 ...

    def initialize

      @pattern = ["extend", "extends"]

      @ext_define_pattern = "extend"

      @ext_define_default = {:extends => "Ext.Base"}

    end

    # @extends classname

    def initialize

      @pattern = ["mixin", "mixins"]

      @ext_define_pattern = "mixins"

      @ext_define_default = {:mixins => []}

    end

    # @mixins classname1 classname2 ...