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
Redesigned submission form
Set E-Mail account as empty be default if not specified
Check for E-Mail account ID existence before accessing a E-Mail account
Show E-Mail account drop box always in case it is not set

Earlier it was only shown new ticket post. It will help when tickets are
created without a E-Mail account. e.g. support form or auto-drafted
tickets
Removed accidentaly created empty files

They were created in d2e0e499e79bfebdea1b1162ae7ee5087f9da98b
Removed unnecessary code
Moved inline CSS to style sheet
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