I3menu

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- nothis to see here [giacomos]

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- major code restyle
- add all the i3-msg commands
- major improvement of the command line interface
- use both rofi and dmenu as menu providers
- name changed: i3-rofi -> i3menu
[giacomos]

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- Initial release
- included menus are: go_to_workspace, move_window_to_workspace,
move_window_to_this_workspace, move_workspace_to_output, rename_workspace,
window_actions, workspace_actions
[giacomos]