Constant turn-rate rectangular target motion model

returns the updated rectangular states from the current rectangular
`updatedstates`

= ctrect(`states`

)`states`

based on the rectangular target motion model. The default time
step is 1 second.

specifies the time step, `updatedstates`

= ctrect(`states`

,`dt`

)`dt`

, in seconds.

additionally specifies the process noise, `updatedstates`

= ctrect(`states`

,`w`

,`dt`

)`w`

.

`ctrectcorners`

| `ctrectjac`

| `ctrectmeas`

| `ctrectmeasjac`

| `gmphd`

| `initctrectgmphd`

| `trackerPHD`