Grouping blocks in Page Builder. Design changes:

• c-sidebar__title-bar has new styling changes added, more padding added (check InVision prototype).
• c-sidebar__blocks:
  • Keeps the existing "max-height" (Suggestion to not change it);
  • c-sidebar__blocks width will be based on Blocks' width and paddings defined.

• For colors use SASS classes provided in https://doc.ezplatform.com/en/latest/guidelines/resources/colors/
• c-sidebar-block:
  • Icons change their size to 20px. Suggestion to add class ez-icon--small-medium;
  • Labels font-size set to 11px and line-height to 12px.
• c-sidebar__toggler consider to define their size to ez-icon--small-medium if the rendering matches size defined in wireframes.
• c-sidebar new box-shadow defined (check InVision prototype).