added dropdown menu scss partial
added dropdown menu scss partial

half finished - still with default styling of the check boxes and
without type icons

tlevine/rhizi,cben/rhizi,tlevine/rhizi,cben/rhizi,Rhizi/rhizi,yuvadm/rhizi,shlomif/rhizi,shlomif/rhizi,cben/rhizi,tlevine/rhizi,tlevine/rhizi,ozFri/rhizi,yuvadm/rhizi,cben/rhizi,shlomif/rhizi,yuvadm/rhizi,shlomif/rhizi,ozFri/rhizi,Rhizi/rhizi,ozFri/rhizi,Rhizi/rhizi,ozFri/rhizi,yuvadm/rhizi,Rhizi/rhizi