This moves all export test code to where it belongs:
in LLPermissions.
Added LLPermissions::allowExportBy, next to
allowModifyBy, allowCopyBy and allowMoveBy.
Then changed all code to use this call.
Because LLPermissions is part of llinventory, I had
to add a proxy for LFSimFeatureHandler.
Added a new class LFSimFeatureHandlerInterface that can be
used by LLPermissions to check simulator features by
accessing the LFSimFeatureHandler singleton.
Several parts of the code ignored the PERM_EXPORT but
and still did demand that things are full perm next
to being a creator. This has now changed the export
rules are the same for everything as they were for mesh:
you need to be the owner and the creator for every element
that is exported (not just the root prim, of course).
Export rules can now be easily made a function on
simulator features. If different rules apply for different
types (wearables, objects, mesh etc) then an extra variable
indicating the type will have to be passed though.
