This helps provider better logs. With this, the user can now run
with `-v` for verbose logs, use more `-v` to be more verbose,
eg `calls -vvvvv` log shall be very verbose
Simply return NULL when these methods are called.
If not implemented, calling these methods may result
in crash when the subclasses haven't implemented them.
Calls can't handle multiple calls, so there is no
point in handling all URIs.
Handle opening URI in activate(), which will be helpful
when we use local_command_line()
Also, this commit fixes presenting window on initial
launch of Calls with a “tel:” URI
And adapt to changes
It's easier to track changes if we are using GListModel than
a GList. Also, eventually we shall have multiple providers,
and we can use GtkFlattenListModel to merge multiple origins
without manually managing pointers ourself.
Since several widgets has APIs to handle GListModels, it will
also help us create widgets from GListModels easily.
GtkApplication by default appends "icons" to the app id and add that
to the icon search path. So let's just use that instead of adding
custom one.
This commit also fixes missing icon for "Add call" button in active
call window
We want to remove the modem if the currently removed interface is
Voice. It was previously removing the device if the removed
interface wasn’t Voice.
Fixes https://source.puri.sm/Librem5/calls/issues/94
