Pyprland

- quick fix for the [wallpapers](https://github.com/hyprland-community/pyprland/wiki/wallpapers) plugin

- supports [variables](https://github.com/hyprland-community/pyprland/wiki/Variables) in the config
- supported in [scratchpads](https://github.com/hyprland-community/pyprland/wiki/scratchpads)' `command` and [shortcuts_menu](https://github.com/hyprland-community/pyprland/wiki/shortcuts_menu)'s `entries`

- fix the string reported by `pypr version`

- still didn't fix the string reported by `pypr version`
- [scratchpads](https://github.com/hyprland-community/pyprland/wiki/scratchpads): fix an old regression affecting the first display of `lazy` scratchpads

Two new plugins:

- [wallpapers](https://github.com/hyprland-community/pyprland/wiki/wallpapers)
- [system_notifier](https://github.com/hyprland-community/pyprland/wiki/system_notifier)

Some additions, mostly for developers:

- `pyprland.plugins_paths` allows to add extra paths where plugins can be loaded
- single file plugins (eg: extension is "foobar.Extension") can still be loaded by adding the `external:` prefix to it, as in `plugins = ["external:foobar"]`

- [magnify](https://github.com/hyprland-community/pyprland/wiki/magnify): allow relative change of the `factor` (eg: `+2`)
- [scratchpads](https://github.com/hyprland-community/pyprland/wiki/scratchpads): small optimization (on hide) getting rid of potential error

New [scratchpads](https://github.com/hyprland-community/pyprland/wiki/scratchpads) option to "pin" the scratchpad to a specific screen: `force_monitor`