Minor cleanup, renamed Terminology -> Depencies
editorial changes
Editorial cleanup

Simplified dependecies section.
Removed event handler event types, as it's never used.
Task source now has it's own section.
Minor fixes.
Bunch more editorial fixes
Clarified why MSISDN should not be used (closes #169)
fixed up wording of states (closes #168)

Also removed duplicate state definitions.
Moved multi party call state behavior + tidy
fixed up markup.
removed call history from abtract, as it's non-normative (relates to #155)
telephony attr now noLegacyStyle (closes #173)
Editorial fixup
Fixed up some cross refs. Rewrote call state definition
Removed TCallControl to monito call. Implied elsewhere.
Removed text that was no longer need about event handler
Maked algorithmic looking text in multiparty call as issue
fixed up multiparty call a bit
content reshuffle
More text reshufle (including #176)
Made a section for tones