Performance and UI improvements

This is a new major release which have focus on better performance and a more slim UI. A big part of the UI changes are related to the inline editing to make it more intuitive.

General UI:

• [FEATURE] Buttons on right bar to edit/create a page
• [TASK] Darker loading screen
• [BUGFIX] Prevent double confirm modal on delete action
• [BUGFIX] Use already initialized language service $GLOBALS['LANG']
• [TASK] Make the save key more unique
• [TASK] Add notification for when opening inline editing and unsaved changes

Inline editing:

• [FEATURE] Add 'New' action icon
• [FEATURE] Make record editing possible (like news records)
• [TASK] Change showing hidden elements
• [TASK] Move action icons to left
• [FEATURE] Retain scrollbar position after reloading
• [FEATURE] Handle drag&drop of nested CE
• [TASK] Improve dropzone active state
• [TASK] Add record title to ''title'' attribute in inline actions icon

Performance:

• [TASK] Load page by ajax request without get variable
• [TASK] Set iframe content direct on first load
• [BUGFIX] Unset page setup before render the toolbars