Peter M. Groen / openbr

Fix compile under visual studio

Conflicts:
	openbr/plugins/slidingwindow.cpp

Conflicts:
	openbr/plugins/slidingwindow.cpp

Leverage stream to do enrollment more efficiently

Move progress counter after gallery output, this should hopefully give slightly
more accurate initial ETAs.

When doing the finalize step in stream projectUpdate, don't push empty sets
through the rest of the transforms (this reduces spurious calls to project,
making progress counter work slightly better).

Conflicts:
	openbr/core/core.cpp