Add basic ProfileEditor.
Use system default settings for the app suite.
Get profile information from settings.
This entire plist business is messy, but by default the port is
retrieved from settings as a 64-bit long long. Now, setting it later
causes it to be cast back to uint16_t, which ruins all calls _after_
the call to link::init_link(), the only cure I see is to forcedly cast
it back to long long when setting.
Bump submodules.