0d7bd0f9b6
This prevents access to non-existent typeinfo during type initialization, when node types have been removed and such nodes are deleted from older files. All blenkernel functions now only set the node->update flag instead of directly calling the update function. All operators, etc. calling blenkernel functions to modify nodes should make a ntreeUpdate call afterward (they already did that anyway). Editor/RNA/renderer/etc. high-level functions still can do immediate updates by using nodeUpdate and nodeUpdateID (replacing NodeTagChanged/NodeTagIDChanged respectively). These old functions were previously used only for setting compositor node needexec flags and clearing cached data, but have become generic update functions that require type-specific functionality (i.e. a valid typeinfo struct).