Autosaving thread data

It will autosave all the elements with class `sf_autosave` as post meta
with key `_sf_autosave_$element_id`. Currenly it autosave cc, bcc and reply box.

Currently it don't support autosave functionality in new threads
Sending element ID rather than name during autosave
Corrected WP coding standard
Auto save also new tickets
Enable autosave for post title and respondents in draft tickets only
Removed accidentaly created empty files

They were created in d2e0e499e79bfebdea1b1162ae7ee5087f9da98b
Add parameter to disable loading of table navigations
Add parameter to disable loading of table columns
Add comment explaining parameter to table constructor
Allow empty string to be set as table no item message
Created a meta box in view ticket page showing agent recent tickets
Allow basic HTML tags to be inserted into reply

Fixes #127
Removed created columns todo comment

It is already done
[Bug] get_ticket_replies_count() was not overriding arguments
Corrected coding standards
get_ticket_respondents() allow retrieving slug of E-Mails
Added meta box to show recent tickets by ticket respondents

It replace an earlier meta box which displays other ticket owned by logged
in agent
Using unique HTML ID for both save buttons
Toggle submit button label on adding private note

It toggles between "Send Message" and "Add private note"
Added ticket status column to recent tickets by respondents meta box