added classes: MultiFileHashMap, CommandCreate
tmp commit 1
Command Drop added
tmp commit 2
Command Use added
All functional (besides show tables) added, but not tested
tmp commit #3. some bugs fixed (add and drop table)
problems with versions 2
command show tables added
fixed bugs in load file
tested project
Changes in  work with start directory
remove debug output
bug fiixed in load
attempt to merge
attempt to merge (2)
attempt to merge (3)
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attempt to merge (6)