Added the -pbuseicontheme flag; closes #122.

• Added -open and -close flags and signals; @121 by @RRRRRm;
• dependencies updated, except for gotk3 0.6.4, that refuses to build.

• The /usr/share/nwg-drawer path un-hardcoded, will be searched in XDG_DATA_DIRS from now on; closes #115;
• if power bar present, pressing the Tab key will move focus to its first button;
• go 1.21 -> 1.22;
• golang.org/x/sys v0.16.0 -> v0.17.0.

• fixed #110

• gotk3 0.6.2 -> 0.6.3.

• fixed installation of README.md & LICENSE;
• fixed finding the user-dirs.dirs file (necessary to search files inside XDG user directories);
• added power bar icons below the application grid, requested in #111:

For each power icon to appear, you need to provide a corresponding command in arguments:

  -pbexit 'string'
    	command for the Exit power bar icon
  -pblock 'string'
    	command for the Lock power bar icon
  -pbpoweroff 'string'
    	command for the Poweroff power bar icon
  -pbreboot 'string'
    	command for the Reboot power bar icon
  -pbsleep 'string'
    	command for the sleep power bar icon

The pbsize argument determines power icons size.

  -pbsize int
    	power bar icon size (default 64)

• The -o <string> argument (name of the Output to display the drawer on) from now on works as well on sway, as on Hyprland.

• Added status-line-wrapper and status-label CSS ids, to allow styling the status line; #104 by @Schuldkroete;
• removed setting the -wm argument value from the XDG_CURRENT_DESKTOP environment variable by default;

Setting XDG_CURRENT_DESKTOP value as the default -wm argument value basically makes the argument unnecessary. This way on sway and Hyprland we always have auto-detection, and we always launch apps via the compositor. I want users to have a choice, and give up on this feature if they want, by just not using the -wm argument.

• allow capitalized Hyprland string as the -wm argument value (as the command to run Hyprland is capitalized, people may tend to write the argument this way).

• changed command execution logic to use /usr/bin/env -S <command>; #103 by @gouvinb

• added -wm sway | hyprland argument; if set, programs will be launched via either swaymsg exec <command> or hyprctl dispatch exec <command>; #101, #102 by @gouvinb;
• golang and libraries versions updated.