Remove applications from portfolio administration

Right now, applications can be managed through the global portfolio administration (aka, "views console"). However:

• This is confusing; there's no clear indication that this is possible
• There's no clear use-case around having such a centralized administration for applications (we don't have it for projects either)

In order to simplify the UI and administration experience, we've decided to drop applications from the global portfolio administration. Meaning:

• Do not show applications in the left menu of the views console
• Remove the ability to create a new application via the “Create” modal
• Even if an application key is passed via the URL directly, do not show the console; instead, redirect to the application console directly (/application/console?id=KEY)
• When clicking on "Recompute All", do not recompute applications, only recompute portfolios
• Deprecate the fact that /api/views/list returns applications