added saving generated code
added SystemEvents
clean
added CodeManager
added management of code and diagram tabs
minor changes
save and save as for code and another minor changes
usual saving, window title and star for modified files
'new'
Create README.md
Added base generator class infrastructure;
Implemented primary validation.
Primary control flow validator seems to be accomplished
Small refactring for visitors
Visitor interface expanded a bit
Added some primary infrastructure to rules/zones classes
Accomplished basic declarations
Implemented semantic tree building in the simplest case
Added simple infinite loop case processing
Added simple if block case processing
Added merged if branches processing