Added chunk and longstr types

- strings are now "string" or "longstr"
Removed limitations on strings and dictionaries

- count is now 4 octets
- strings entries are longstr
- instead of 'key=value', stored as string, longstr

    ; A list of string values
    strings         = count *value
    value           = longstr

    ; A list of name/value pairs
    dictionary      = count *( name value )
    count           = number-4
    name            = string