Add overlay background

[ildar170975]

Added a possibility a customize:
overlay background when locked / blocked;
outline for an overlay in a row when locked / blocked;
border radius for an overlay in a row

New theme variables are introduced:
restriction-overlay-background
restriction-overlay-background-blocked
restriction-overlay-row-outline
restriction-overlay-row-outline-blocked
restriction-overlay-row-border-radius

[antoniodvr]

Didn't have much time to validate it @ildar170975 but I do have the feeling that 'duration' attribute doesn't work properly with the overlay (the lock gets removed right away).

[ildar170975]

@antoniodvr
Thanks for testing!

Consider this code:

type: vertical-stack
cards:
  - &ref_card
    type: custom:restriction-card
    action: hold
    card:
      type: entities
      entities:
        - entity: input_boolean.test_boolean
  - <<: *ref_card
    duration: 10
  - <<: *ref_card
    duration: 2

Check with a default theme:

Check with a theme provided in Readme:

Note that restriction-lock-opacity: 0 - no lock is shown.

Check with same theme with restriction-lock-opacity: 0 removed:

The lock icon is not removed immediately.
A duration of this transition is NOT controlled by the duration option, it is fixed (2 sec, you can customize it by card-mod).

The background changes immediately.
Probably making it changing like the icon would be a nice improvement, I will think how to do it.

[ildar170975]

@antoniodvr
FYI: prepared a PR for "background slowly disappearing" feature: #132
Released in 1.2.13.