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).
Don't consider window properties for project changes
Remove unused variable, add serialVersionUID
Remove ComboCoords control, which isn't a general purpose control and it is not used anymore
Reorder flow
Ensure the control exists before trying to remove it
Add methods to: remove labels, add and remove controls; rename setLabels method.
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