Add a couple of interface definitions

Public cache etc.

Conflicts:
	lib/public/iservercontainer.php
	lib/server.php

Public session

Refs #4863

Fix Sharing "Expiration Date" on Oracle

refactor upload js & html to always use only js to fill form data

Add OCP\DB::getErrorMessage() to public namespace.

/OC/Server has created too early causing issues with config operations as OC:$SERVERPATH was not yet initialized

This fixes unit test execution

adding null check on a mount's storage

use lineheight instead of padding and height