wmctrl: add page (#4038)

pages/linux/wmctrl.md

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+# wmctrl
+
+> CLI for X Window Manager.
+
+- List all windows, managed by the window manager:
+
+`wmctrl -l`
+
+- Switch to the first window whose (partial) title matches:
+
+`wmctrl -a {{window_title}}`
+
+- Move a window to the current workspace, raise it and give it focus:
+
+`wmctrl -R {{window_title}}`
+
+- Switch to a workspace:
+
+`wmctrl -s {{workspace_number}}`
+
+- Select a window and toggle fullscreen:
+
+`wmctrl -r {{window_title}} -b toggle,fullscreen`
+
+- Select a window a move it to a workspace:
+
+`wmctrl -r {{window_title}} -t {{workspace_number}}`