foreign-toplevel-manager based taskbar module (#692)

Co-authored-by: Alex <alexisr245@gmail.com>

man/waybar-wlr-taskbar.5.scd

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+waybar-wlr-taskbar(5)
+
+# NAME
+
+wlroots - Taskbar module
+
+# DESCRIPTION
+
+The *taskbar* module displays the currently open applications. This module requires
+a compositor that implements the foreign-toplevel-manager interface.
+
+# CONFIGURATION
+
+Addressed by *wlr/taskbar*
+
+*all-outputs*: ++
+	typeof: bool ++
+	default: false ++
+	If set to false applications on the waybar's current output will be shown. Otherwise all applications are shown.
+
+*format*: ++
+	typeof: string ++
+	default: {icon} ++
+	The format, how information should be displayed.
+
+*icon-theme*: ++
+	typeof: string ++
+	The name of the icon-theme that should be used. If omitted, the system default will be used.
+
+*icon-size*: ++
+	typeof: integer ++
+	default: 16 ++
+	The size of the icon.
+
+*tooltip*: ++
+	typeof: bool ++
+	default: true ++
+	If set to false no tooltip will be shown.
+
+*tooltip-format*: ++
+	typeof: string ++
+	default: {title} ++
+	The format, how information in the tooltip should be displayed.
+
+*active-first*: ++
+	typeof: bool ++
+	default: false ++
+	If set to true, always reorder the tasks in the taskbar so that the currently active one is first. Otherwise don't reorder.
+
+*on-click*: ++
+	typeof: string ++
+	The action which should be triggered when clicking on the application button with the left mouse button.
+
+*on-click-middle*: ++
+	typeof: string ++
+	The action which should be triggered when clicking on the application button with the middle mouse button.
+
+*on-click-right*: ++
+	typeof: string ++
+	The action which should be triggered when clicking on the application button with the right mouse button.
+
+*on-update*: ++
+	typeof: string ++
+	Command to execute when the module is updated.
+
+# FORMAT REPLACEMENTS
+
+*{icon}*: The icon of the application.
+
+*{title}*: The title of the application.
+
+*{app_id}*: The app_id (== application name) of the application.
+
+*{state}*: The state (minimized, maximized, active, fullscreen) of the application.
+
+*{short_state}*: The state (minimize == m, maximized == M, active == A, fullscreen == F) represented as one character of the application.
+
+# CLICK ACTIONS
+
+*activate*: Bring the application into foreground.
+*minimize*: Minimize the application.
+*maximize*: Maximize the application.
+*fullscreen*: Set the application to fullscreen.
+*close*: Close the application.
+
+# EXAMPLES
+
+```
+"wlr/taskbar": {
+    "format": "{icon}",
+	"tooltip-format": "{title}",
+	"on-click": "activate",
+	"on-middle-click": "close"
+}
+```
+
+# Style
+
+- *#taskbar*
+- *#taskbar button*
+- *#taskbar button.maximized*
+- *#taskbar button.minimized*
+- *#taskbar button.active*
+- *#taskbar button.fullscreen*