Add UI for managing profiles

[WheteThunger]

Using the maprofile * commands is very powerful, but it would be awesome to have a UI to manage profiles.

• Allow viewing profile metadata such as name and author, enabled/disabled/selected status
• Allow selecting profiles
• Allow enabling/disabling profiles
• Allow reloading profiles
• Allow viewing the contents of a profile
• Allow removing specific addons
• Allow teleporting to specific addons
• Allow focusing on specific addons with ddraw
• Allow browsing official downloadable profiles
• Allow installing profiles
• Allow updating installed profiles
• Allow viewing upstream changes to installed profiles