Update responses and models

Client: Update getToken() to new cookie method

- No longer has to check cookie expiration manually since `getCookie()`
  was changed.
- Now also checks for empty string values and treats those as null.

Models: Add new properties

Push&Realtime: Update non-CLI warning message

Just a slight grammar tweak for clarity.

Utils: Unified function for adding media locations

- New, unified Utils function for validating and generating the media
  "location" parameter used by various functions that can attach
  locations to media uploads. This avoids code repetition.

- We now explicitly FORBID locations that came from the Facebook-based
  location search functions, because they are NOT valid as media
  locations. They MAY work but there's no guarantee. The real app never
  uses those endpoints when attaching media locations. So we now throw
  exceptions if the user gives us a facebook location.

- Updated function documentation in Location.php to clearly notify users
  which function to use if they want to attach media locations.

Instagram: Refactor and simplify login() system

This simplifies the previous, confusing setUser()+login() system, to now
just needing login() and nothing else. It should help all of the users
who were confused by the old system (many people tried just doing
setUser() and then never calling login(), etc).

The fact is that we ALWAYS need to call login() anyway, so this new
system simply takes care of setting the user automatically.

- login() now takes two new parameters: $username, $password.

- login() now automatically calls _setUser() internally.

- setUser() is no longer a public function. Users should no longer call
  it manually.

- The login() function documentation has been improved.

- Renamed twoFactorLogin() to finishTwoFactorLogin() to make it clearer
  that it ISN'T a "standalone login function" and that it's meant to be
  called AFTER the regular login() attempt. This helps avoid confusion.

- Added the "$appRefreshInterval" param to finishTwoFactorLogin() to let
  users control the state refreshing interval even when they're doing
  two-factor logins.

- The finishTwoFactorLogin() function documentation has been improved.

Update instagram signature key to 10.9.0

accessingValues example

More fixes

adatImage not required