Remove STC-S reference

[gpdf]

The current draft still contains this sentence in the POS section:

This syntax for circles and polygons is in the same style as STC-S, but with no reference positions, coordinate systems, units, or geometric operators (union, intersection, not).

This is a very large "but", to the point where the reference to STC-S seems misleading. Probably this should point to DALI's shape instead? It seems most likely that DALI 1.2 will get done before DAP, so can we just change this now in the draft?

[gmantele]

Regarding the discussions during the DAL 1 session in May 2024 (Sydney) Interop, I indeed highly encourage this change.

[pdowler]

I think WD-DALI-1.2 can come close to completely replacing any need or reference to STC-S and POS could be defined with reference to DALI (xtype="shape"). And yes, we need to do this cleanly and asap.