actions related to accounts are scattered around

Please note by far the quickest way to get a new feature is to file a Merge Request.

Description of the new feature

actions related to an account are all over the place, which makes Gajim confusing to use. Examples & solutions:

• click accounts > manage accounts > [name of account], you get some settings related to that account, but other settings are in the dropdowns. SOLUTION: Put "Profile", "Server Info", "Manage Contact List", "Archiving Preferences", "Blocking List", "PEP Configuration" and "Synchronise History" in that account settings screen, establishing that its the place to go to when you want to change anything about your account. For "Discover Services" and "Execute Command", make it act similar to the "Add Contact" popup - you click the button, then choose an account, and then type in the JID you want to browse/command.
• Manage Contact List doesn't have a button to add new contacts. I think adding a new contact is part of "managing" your contacts. SOLUTION: Add a + or "add contact" button that works in the same way as the "add contact" popup (perhaps omitting the dropdown to select an account)
• Status is in a completely different spot, in the corner. SOLUTION: add it to the account settings screen, along with the first point. or add a "change status" button to the dropdown.