added BM_mesh_elem_flag_enable_all (only had disable function), and add argunt for vert/edge/face type. use these functions from EDBM_flag_enable/disable_all (had duplicate code).
added BM_mesh_elem_flag_enable_all (only had disable function), and add argunt for vert/edge/face type. use these functions from EDBM_flag_enable/disable_all (had duplicate code).