added vec math helpers
added vec math helpers
refactored layout calculation , moved entirely into 'layout', to decouple it from client window bitmap creation in 'clientwin.c; added passed parameter to control layout mode LAYOUT_ORIGINAL, LAYOUT_DESKTOP..
refactored layout calculation , moved entirely into 'layout', to decouple it from client window bitmap creation in 'clientwin.c; added passed parameter to control layout mode LAYOUT_ORIGINAL, LAYOUT_DESKTOP..
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