Composer actions menu and Attachments menu

We need some unification of the composer actions menu (right now it's a radio-based switch of the full composer mode) and the attachments menu.

Right now the looks are different, and while maybe the radii could be different, as well as purpose, something could be similar.

In particular:

• the composer menu shall also include actions such as "Call", especially on mobile, where the pressing of the button won't switch to a mode, but instead initiate a call. Note that the current content if any needs to be added as user content, and mic stopped, etc.. like pressing the beam button (what would the call button on the composer do, finish recording? Make sure it does). This gives us the option to remove the call button (but leave it for now) from the composer, while on mobile, this may be the only way to initiate a chat-call
• the mobile attachment menu needs to be unified with the "new" attachment menu. As such it will have the camera attachment, which is great to have in that menu, while commenting out the code for the mobile button in the composer (getting too busy). Have a const MOBILE_CAMERA_IN_MENU = true at the top to toggle the behavior.

Please evaluate carefully and be aware of the responsiveness and side effects of all buttons and actions.