Feature Request: Login profile support

[Litesung]

As a user with multiple accounts I want to use XIVLauncher to manage different profiles (ie. User Logins + settings) So that I can switch user profiles with key combinations

Example: If a user wants to log in to Profile 2, they can hold Shift+2 while the application is launching to use Profile 2's credentials. XIVLauncher will launch the last profile used by default on the next launch when auto-login is enabled and no key combination is pressed, but there should also be an option in the settings to always use a specific profile when no key combination is pressed (i.e. Profile 1 set as Default Profile on launch).