Integration with offline layer.
Fixed problem with integration.
Caching was broken due to a merge.  Should be fixed again.
Partial commit
Merge
Compiling again, but not working.
Can move a single frame through the system.
All frame loading working again.
Frame loading more or less working.
Merge branch 'develop_2_3' into frame_loading
Loading failure fix.
Minor fix for texture indexing.
Trying to fix the submodule references
Merge branch 'develop_2_3' into frame_loading
Found a crash when a tile fails to load.  Tracking number of loads.
Fixed a duplicate loading problem that was causing havoc.  Added more frame loading logic.  Now seems to load cleanly.
Frame based loading better debugged.
Tracking connections correctly.  Reporting frame loading status.
Providing access to loading priority.  Found texture loading bug.
Put some guard code around setting frame priorities.