feat(extensions): introduce extension support (#2527)

* wip

* wip: missing repository & tags removal

* feat(registry): private registry management

* style(plugin-details): update view

* wip

* wip

* wip

* feat(plugins): add license info

* feat(plugins): browse feature preview

* feat(registry-configure): add the ability to configure registry management

* style(app): update text in app

* feat(plugins): add plugin version number

* feat(plugins): wip plugin upgrade process

* feat(plugins): wip plugin upgrade

* feat(plugins): add the ability to update a plugin

* feat(plugins): init plugins at startup time

* feat(plugins): add the ability to remove a plugin

* feat(plugins): update to latest plugin definitions

* feat(plugins): introduce plugin-tooltip component

* refactor(app): relocate plugin files to app/plugins

* feat(plugins): introduce PluginDefinitionsURL constant

* feat(plugins): update the flags used by the plugins

* feat(plugins): wip

* feat(plugins): display a label when a plugin has expired

* wip

* feat(registry-creation): update registry creation logic

* refactor(registry-creation): change name/ids for inputs

* feat(api): pass registry type to management configuration

* feat(api): unstrip /v2 in regsitry proxy

* docs(api): add TODO

* feat(store): mockup-1

* feat(store): mockup 2

* feat(store): mockup 2

* feat(store): update mockup-2

* feat(app): add unauthenticated event check

* update gruntfile

* style(support): update support views

* style(support): update product views

* refactor(extensions): refactor plugins to extensions

* feat(extensions): add a deal property

* feat(extensions): introduce ExtensionManager

* style(extensions): update extension details style

* feat(extensions): display license/company when enabling extension

* feat(extensions): update extensions views

* feat(extensions): use ProductId defined in extension schema

* style(app): remove padding left for form section title elements

* style(support): use per host model

* refactor(extensions): multiple refactors related to extensions mecanism

* feat(extensions): update tls file path for registry extension

* feat(extensions): update registry management configuration

* feat(extensions): send license in header to extension proxy

* fix(proxy): fix invalid default loopback address

* feat(extensions): add header X-RegistryManagement-ForceNew for specific operations

* feat(extensions): add the ability to display screenshots

* feat(extensions): center screenshots

* style(extensions): tune style

* feat(extensions-details): open full screen image on click (#2517)

* feat(extension-details): show magnifying glass on images

* feat(extensions): support extension logo

* feat(extensions): update support logos

* refactor(lint): fix lint issues

api/http/handler/endpoints/endpoint_extension_add.go

@@ -1,5 +1,7 @@
 package endpoints
 
+// TODO: legacy extension management
+
 import (
 	"net/http"