IDE: improved TNotebook icon, patch from Vojtech Cihak, bug 24725

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42052 4005530d-fff6-0310-9dd1-cebe43e6787f
LazControls: improved TDividerBevel and TExtendedNotebook icons, patch from Vojtech Cihak, bug 24725

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42053 4005530d-fff6-0310-9dd1-cebe43e6787f
Docs: added Vojtech Cihak to contributors list

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42054 4005530d-fff6-0310-9dd1-cebe43e6787f