Corrected missprints.
Start static analysis.
Remade solution-file
Added 'instanceOf'
Added several incorrect identifiers.
Replaced strings to 'ID'.
Remade expample of tree.
Replaced strings to ID.
Added new constructor for 'Position' and set in field 'Position' in 'Node'.
merge StaticAnalysis conflict
Add content in each block, parent in each Statement, interpret assign and declaration
add variable interpret