Permissions UI: Misc improvements and bugs

[ashklianko]

Improvements:

• Apply changes must jump to the summary step, not submit immediately
• Apply to step: Disabled radio options labels must look more disabled (set opacity of labels to 0,5)
• Apply to: Children only (0) -> Children only
• Apply to : Show tooltip ('This item doesn't have children') when hovering over disabled radio buttons if item has no children
• Apply to: Show our standard help icon right to the radio label, explaining what the step affects, with the help text below it (requires Help text: move related styles to a separate .less file #4021 lib-admin-ui#4022)
• Strategy: Disabled radio label should have 0.5 opacity
• Strategy: Show a tooltip as for 'Apply to' if no children or if chose to apply to a single item
• Strategy: Show our standard help icon right to the radio label, explaining what the step affects, with the help text below it (requires Help text: move related styles to a separate .less file #4021 lib-admin-ui#4022)
• Main step: 'Copy from parent' button text -> 'Set from parent' since it overwrites permissions
• Submit -> Apply (X)
• Apply changes -> Apply (X)
• Summary step: Show the list of changed principals in the tooltip on hover
• Summary step: 'Changed' label must show number of changed principals -> Changed (X)

Bugs:

• Widget stops showing principal icons
• Details didn't show added principal
• Remove 'V' from permissions labels in Custom permissions - Solved in Move permission-selector.less to CS #4017 lib-admin-ui#4018

[ashklianko]

Help texts requires enonic/lib-admin-ui#4021