Show a red rectangle when the real icon was not found, and show an error in the log. We don't crash anymore when an icon is not found.
Properly manage different groups of selectable tools
Rename getSelectedTool to getSelectedTools to reflect that now it's possible to have different selectedTools (on different groups)
Consider the different button groups when changing the active window (for the selected tool group).
Exceptions
Don't consider window properties for project changes
Remove unused variable, add serialVersionUID
Totally discard actionListeners for Label, as they don't have any action to listen.
Disable action listeners for the moment for setValue.
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