Account, added register function as REST call.
Made accounts/Accounts model better extendable.
Reworked update script:
 * New class structure
 * Uses reference-id's
Created support for `old_title` key in package.json.
Fixed small bug in referencing scenario's.
Updated documentation after DB updates rework.
Fixed update bug for inserting new components.
Merge branch 'master' into account-register
Improved registration function and implemented a registration module.
Fixed permission bug for keep alive.
Several tweaks:
* Added a template function to PageTypes.
* Extended $.restForm to return a reference to the form in callbacks.
* Fixed a securimage bug after the core rework.
* Added .clearfix to the global.css asset.
Some small tweaks:
 * Added `indenting_field` option with `Data()->as_options()`.
 * Added `$path` variable inside plugins.
 * Added `str_max` now trims whitespace.
Added basic fieldset support in `render_form`.
Expanded render_form to include additional fields if they are defined in the options.
Extended image class to track diversions.
Fixed some typo's.
Fixed bug with core update script.
Fixed for real now.
Fixed bug with file reference updates.
Updated documentation for the new release.