Update usage of streams, add WindowBuilder
Update usage of streams, add WindowBuilder
sazgin/elexis-3-core,sazgin/elexis-3-core,elexis/elexis-3-core,elexis/elexis-3-core,elexis/elexis-3-core,sazgin/elexis-3-core,sazgin/elexis-3-core,elexis/elexis-3-core