Better algorithm for updating EnergyGlob list.

This only deletes EnergyGlob entities when they don't exist anymore.
Also, ordered list synchronization only makes one fetch request containing all entities, instead of many requests for one entity.
Draw all EnergyGlob objects in on XMOverlayView.
Include full XM description in log.
Merge pull request #61 from mzagozen/overlay-performance

XMOverlay performance