Cleanup the code and 41 support

[jrahmatzadeh]

Cleanup prefs.js and extension.js

Removed

• Unnecessary imports.
• Unnecessary PrefsWidget class.
• tools.js since it is not needed anymore.
• Trailing spacing and tab + chars lines.
• Getting gsettings in global scope that can cause rejection on ego.
• Connecting signal in init that can cause rejection on ego.

Added

• Debug mode for logs (will be rejected if you send it with normal log, Before sending for review you need set "debug" to false in metadata.json).
• jsdoc.
• resetToggleStatus function to have more organized resetting toggle.
• Separate minimizeWindows and unminimizeWindows functions to have more readable code.

Changed

• Settings signal for more accurate and correct changed signal.
• If statements to more readable statements.

GNOME Shell 41 Support

While the support has been added to the metadata.json you need test it before release it on ego. Should work on 41 but I haven't tested it.

[amivaleo]

Thank you dude...