1. continue development of battle model (separating on files)
2. throwing verbose exception from stack inspector in case if entity wasn't found (instead NPE)
1. adding 'Find' operation which looks for entity which belongs to another context in complex entity which belongs to differenet context (1). In success entity from (1) is returned
2. extended parameters of 'Do' operation by adding context to which loaded entities should belong
3. reorganized mechanism of loading mazes
1. Fix NPE in case if context has already been created
2. incorrect bahaviour during dynamic context addressing fixed
3. continue development of battle
Merge branch 'origin/master'