Replace deprecated FlowPort

"To convert a SysML 1.2 flow port to ports in this version of SysML it is recommended to use the following guidelines:

Decide if the port should be converted to a proxy port, a full port, or an unstereotyped port.
Based on the decision in step 1, create a block (for proxy ports, it shall be an interface block specifically).
If the original flow port is non-atomic:
- a. Copy all the flow properties owned by the flow port's type, a flow specification, to the block created in step 2 (meaning the flow properties will be owned by the newly created block).
- b. Replace the type of the port with the block created in step 2.
- c. Remove the flow port stereotype from the port.
- d. Based on the decision in step 1, apply the ProxyPort or FullPort stereotype, or do nothing if the decision is not to use either one.
- e. If the proxy stereotype is applied in step 3d, and there is a single connector from the port to a part, the BindingConnector may be applied to the connector. f. If the flow specification is not referenced by other model elements, delete it.
If the original flow port is atomic:
- a. On the block created in step 2, specify a flow property typed by the same type as the flow port and with the same direction as the original flow port.
- b. Do steps b to d from step 3 about non-atomic flow ports."