Updated ToSpeckle conversion to use 3/4 Mesh face indicator

[JR-Morgan]

All of our connectors have supported ToNative 3/4 indicators for many releases. But for the sake of a transition period we kept 0/1 around for a while. Now, for the sake of simple documentation, we can finally switch to using 3/4 indicators the for all ToSpeckle conversion.

This PR should be merged as part of our next release. Needs testing in all connectors as per usual release testing.

[JR-Morgan]

We may want to delay merging this pr for another release. @AlexandruPopovici found a bug in the viewer that means previous server releases won't be forwards compatible.

[AlanRynne]

Dynamo was just updated to use 3,4 mesh indices on #1430