UI fix and sub-folder loading/saving for acs 7.2

[swagnerfaw]

• Fix z-index for save/load menus so that menus are shown above code window (original idea from @deas)
• Fix ids for save/load menus submenus so that submenu items are not doubled.
• Change save of existing script to nodeRef so that also submenu script save works
• Add possibility to create script in submenu if a name is entered with submenu path ("subfolder/newScriptName")