- removed master_directive_snippet code that was (in 2016) accidently backported from master but never used

- move all updates to onAfterUpdate
- remove server parts that are not needed

- made placeholders visible for apache, too
- added event raise at formdef loading (on_before_formdef and on_after_formdef)
- added possibility to put plugin files into module/lib/plugin.d/ directory

- cleaned up some javascript

- Included new icons and buttons
- Layout scaling improved (up to 1260px width)

- Directive snippets can now be made available to clients; clients can select an available directive snippet for a website - the appropriate snippet will then be written to the vhost configuration file. This is useful for example on nginx where clients have no access to the Options tab of a website.

- Fixed: nginx placeholders could not be added to directive snippets textarea by clicking on the link.

- nginx: added {DOCROOT} and {FASTCGIPASS} placeholders to directive snippets and nginx Directives fields.

- New feature: you can now add directive snippets for Apache, nginx, and PHP under System > Directive Snippets. These snippets are then available on the Options tab of a web site where they can be easily added to the respective textarea by simply clicking the name of the directive snippet.

Fixed: password match function blocked tabs incorrectly
Fixed: set focus on username input field threw an error if this field did not exist on a page

Fixed: FS#475 - DNS - when adding an A record and clicking BACK you can see records for all domains 

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