Add timer to recover the i3wm ipc

[z1gc]

An old problem is that the plugin cannot work normally if the i3wm starts before xfce4-panel as in #62, here we're using a timer to handle the ipc resources' acquisition.

May still have some segfault there.

Tested in archlinux with latest xfce4-panel (v4.18.4).

[z1gc]

Investigating an error that causing the .xsession-errors during restart i3wm twice or more, crashed in g_io_channel_read_chars: and channel->is_readable.

Backtrace seems indicates an error of i3ipc-glib.

The problem is caused by an unhandled error status code from glib, submitted a PR to altdesktop/i3ipc-glib#41, but may not get merged due to unmaintained.

[denesb]

The problem is caused by an unhandled error status code from glib, submitted a PR to altdesktop/i3ipc-glib#41, but may not get merged due to unmaintained.

This can be worked around in packaging (apply patch which is not applied upstream) if somebody is determined.

This plugin is not really maintained either, pretty much all I do these days is merge PRs so people can use the code they contribute.