improved GOptionPaneW: key handling, support for command error messages, styling 

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31589 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
remove ErrorMessageDialog class

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31590 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
styling tweaks in InoutDialogW

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31591 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
added toolbar hover and selection styling 

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31592 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e