Include 64bit binaries only when the custom ARM64 property is defined

GearVRf-DCO-1.0-Signed-off-by: Mihail Marinov <[email protected]>

Add build files so the old demos can be built in the same manner as

the current demos

Update the url in gvr-jassimp so the tree asset gets loaded

GearVRf-DCO-1.0-Signed-off-by: Mihail Marinov <[email protected]>

Add a cursor to complexScene