Enigma Source (svn, archived)

- fix st_switch state value on instant case
- fix r1000 it-explosion renamed animation error
- world object naming: allow a replacement object with identical name as
predecessor.
- GridObject as basis for connective object:
- support for attribut handling of "connections", "faces", "$connections"
- model handling of connective objects
- ClusterStone as common C++ class for simple stones that support clustering
- "st_panel", "st_brick", "st_bluesand"
- auto clustering by common "cluster" attribute according to 4-color theorem
- dynamic reclustering on change of connections, removed or added
ClusterStones.
ToDo:
- map old Big* stones to new ones and remove old code