Alternate fix for GuiTreeView

Adding `mFlags.set(RebuildVisible)` to `GuiTreeView::onWake()` fixes the problem where the tree is not drawn correctly when nodes are expanded in the TorqueScript `GuiTreeView::onWake()` callback function.
Merge remote-tracking branch 'origin/Fix-GuiTreeView-buildVisibleTree' into HydroSim
Increase max packet size. Kept getting "Out of range write error" from this being too low.