Upgrade to 0.28 - Initial adaptation

[entantoencuanto]

Related to #251

This PR is a step in the adaptation of DecidimAwesome to Decidim 0.28 version, which has important changes on the front. At the moment this PR focuses on the parts of the gem that require less of the front-end changes introduced by the module, such as the Fullscreen Iframe and Awesome map components or the menu tweaks or admin assignations to specific scopes

This PR:

• Makes the essential changes in the gem to make it work in the development environment with a version of Decidim that uses the develop branch (preparing 0.28 release):

  • Changing dependencies in the Gemfile
  • Moving the changes from ProposalMCellOverride (m-cells are deprecated in 0.28) to proposals l-cells. These modifications are pending redesign.
  • Temporarily disables the module's custom js and css

• Adapts blank_component controller to work with 0.28 release adding a method for breadcrumbs

• Adapts Fullscreen Iframe component to 0.28
  

• Adapts Awesome Maps component to 0.28

• Adapts the Menu Hacks feature to 0.28 and overrides breadcrumb menu item presenter to allow the use of links opened in a new window. It also allows to edit the content block main menu which may appear in the homepage

• Adapts the modals used to create and edit constraints to decidim_modals introduced in 0.28
• Recovers the custom css code applied by scopes defined by admins in awesome menu
• Adapts the scopes custom css admin management

• Adapts the scopes admins tweaks admin management

• Updates the icons used by the module to use existing declared ones or register new icons specific of the module
• Refactors the secondary nav menu of the module to use the same conventions of Decidim 0.28
• Changes the tests of the adapted features both in admin and front
• Adds skips to a lot of tests related with functionalities not adapted yet to 0.28
• Copies current configuration of rubocop in Decidim 0.28 and fixes the existing offenses
• Renames the 0.27 workflows to 0.28 and removes the 0.26 workflow

Pending:

• See Upgrade to 0.28 - Admin front updates #257
• Linters: There is currently a problem trying to get js and styles linters configuration because the release 0.28 does not exist and using references to 0.27 seems to break the compilation of the application in the CI engine
• Tests: Remove references in tests to deprecated legacy versions

NOTE - This is a currently work in progress, take in account that this module adapts some parts to 0.28 and disables some other so currently there will be a lot of broken features