[Freeswitch-docs] Request for comment on new channel variable catalog

Hi list, I've mostly completed "normalizing" the channel variables section. On this page: https://freeswitch.org/confluence/pages/viewpage.action?pageId=7766277 DTMF Variables and all pages below show the new catalog. If there is _anything_ you think needs to be tweaked, please let me know. Everything can be changed with relative ease: page ordering, variable ordering, variable groups, formatting, datatypes, etc. Here are some things to look for: - check for correct data types -- we default to string when it's ambiguous/don't know - check for deprecated variables - I can mark them as such - check for variables not marked as readonly - I can mark them as such