Adding Bulgarian states.
Merge branch 'Re-organise-settings'

Moves settings together. Fixes #3497
Moved options around for checkout settings.
Key value pairs for order_meta
Fix fatal error when sending order mail
Merge pull request #3665 from dimitrov-adrian/master

Adding Bulgarian states.
Addon layout fix
escaping
Echo or return current page title. Closes #3660
Make logout an endpoint. Still hide it from menus. Fixes #3589

@coenjacobs do we need to do something about this for .14? Will leave
for you next week :)
Include template hooks early Fixes #3664