remove old code that generated hints
adapt extensionsconf to use hint generator
implement new hint generator
generate hints for each context
meetme hint is spelled in camelcase
fix bug in hint builder

forgot to pass in a list to the hint generator. Also forgot
to include the bsfilter adaptor
check if a hint was generated using the extension

Scenario :
- Given I have a func key with a user destination who has a SIP line
- Given I have a func key with a custom destination that has the same
  extension as the user
- Then I only want the hint for the SIP line to appear

This is how SCCP devices can monitor hints on other resources
remove calluser hints

doesn't seem to be used by xivo anymore
Merge branch '5279_func_key_agent'