update to 1.15.99.6

Changes from 1.15.99.5 to 1.15.99.6

• lots of keywords improvements:
  • validation: lua script to validate the keyword line
  • deprecated: boolean to mark a keyword as deprecated
  • deprecation_message: message if deprecated
  • actions_script: script version of 'actions' in lua
  • lua scripts: now can have real arguments instead of pre-expended ones