[Opensim-dev] Proposal: Change module interface to indicate replacable modules

[Melanie]

The intent of this change is to let a module indicate that it wishes 
it's load to be deferred until all modules have been scanned and 
initialized, and to indicate that it wishes to ot be initialized if 
another module has already registered it's interface.

This will allow automatically disabling modules the developer has 
marked as "stub" modules without full functionality, so that 
replacement 3rd party modules can simply be dropped into the binary 
distribution and get picked up and run instead of that stub.

Melanie