Migrated several samples to 3.2

Migrated the Shapes sample

Migrated a few more samples

Migrated the sampleXML sample

Migrated the robot Kaja sample
Rebuilt the plugin solutions for the recently migrated samples
MPS-21100 Bootstrap languages fail to load with InterpretedLanguageRuntime
InterpretedConceptDescriptor: use bootstrap meta-objects (properties, links and concepts) when filling concepts from model to deal with bootstrap issues of MPS itself.
Use of bootstrap properties (basically, they don't expect to get changed. Now it's only name they don't care to validate each time), although not quite comfortable, limits initialization cycle of a bootstrap language to itself (i.e. core.structure being loaded as interpreted doesn't trigger loading of self to find out about concepts which are in the process of loading).
Avoid constraints for ConceptDeclaration properties, ask values directly from node.
ConceptRegistry: do not query concept descriptors excessively, we might be right inside initialization of this descriptor.
SNodeUtil: use true meta-objects instead of strings