Repeatable hold_action, double tap action, styling for lock and light color css var

NEW FEATURES

• hold_action now has a new parameter: repeat (in milliseconds). If set, while you hold the button, the action will repeat itself every repeat in milliseconds. Fixes #147
  

        - type: custom:button-card
          entity: input_number.test
          show_state: true
          hold_action:
            action: call-service
            repeat: 500
            service: input_number.increment
            service_data:
              entity_id: input_number.test

• New double click action: dbltap_action (this introduces a slight delay [250ms] for single click actions on buttons where you also use double tap)
  

        - type: custom:button-card
          entity: input_number.test
          show_state: true
          hold_action:
            action: call-service
            repeat: 500
            service: input_number.increment
            service_data:
              entity_id: input_number.test
          dbltap_action:
            action: call-service
            service: input_number.decrement
            service_data:
              entity_id: input_number.test

• styling for the lock, available also per state (Fixes #150)
  

  styles:
    lock:
      - color: red
      - align-items: flex-end
      - justify-content: flex-start

• You can now use the current light color in your CSS styles. If a light entity is assigned to the button, the CSS variable --button-card-light-color will contain the current light color so that you can use it where you want on your card. Example:
  

  styles:
    name:
      color: var(--button-card-light-color)
    card:
      - -webkit-box-shadow: 0px 0px 9px 3px var(--button-card-light-color)
      - box-shadow: 0px 0px 9px 3px var(--button-card-light-color)

FIXES

• Misalignment of label for layout: icon_name_state2nd when there was no state.