SYSML16 — remove figure numbers from diagram frames

Remove figure numbers where they still exist within the SysML diagram frame tab. As content is reshuffled in the document, figure numbers inside the diagrams can become out-of-sync with the figure numbers in the document, as is currently the case for figures C.35 and C.37. Maintain the figure number only in the figure caption, not redundantly within the diagram itself.

Diagrams that include figure numbers in the diagram frame tab include 4.2, 4.3, 17.5, C.35, C.36, and C.37.

Remove figure numbers from diagram names

Some figure numbers in diagram names are still there in SysML 1.5, and they are out-of-sync with the numbering in the document.

To decouple them we remove all numberings from the diagrams as proposed.

The following mentioned figures are already fixed in SysML 1.5:
Figure 4.2., Figure 4.3

Figure C.35 is D.38, and C.36 is D.39 in SysML 1.5