DMN13 — Missing "date" FEEL type in some enumerations

FEEL date type is presented in section 10.3.2.3.5 however in some sections of the specification where all FEEL type are enumerated, the date type is omitted.

• Section 7.3.2
  If the type language is FEEL the built-in types are the FEEL built-in data types: number, string, boolean, days and time duration, years and months duration, time, and date and time.

• Section 10.3.1.3
  FEEL supports the following datatypes:
  • number
  • string
  • boolean
  • days and time duration
  • years and months duration
  • time
  • date and time

• In section 10.3.2.12, it is not part of table 42

• Date is part of S-FEEL and this paragraph from section 9.3 should probably be modified too:
  S-FEEL does not support FEEL date and time. However, it supports the date type, which is like FEEL date and time with hour, minute, and second required to be absent. The lexical and value spaces of FEEL date are the literal and value spaces of the XML Schema date datatype.

add missing 'date' type in several places in spec

see revised text