SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
When the notification was closed, the connection was kept around. This
caused the core event loop to take up nearly all CPU, so instead of
checking the connection we clear it on close and add state variables
to check state.
With this RefPtr, we can initialize the connection to the
NotificationServer upon showing the notification. With this, we can
prevent double shows and updates or closes before showing.
This commit puts all of the remaining pieces in place. This adds a
mechanism to update the text, title, and icon of an image. If an image
is not provided, the default ladybug will be shown.
If a notification was closed, the connection will now be dead. To
prevent inconsistencies between when a user closes a notification and
when an application closes an applicated, check if the notification has
been closed before allowing any action.
