refractor tutorial: unverified
clean up codes
fix error
add jump to dialog command
Complete Stage 1_2 tutorial flow. Need to fix some bugs
fix balance zone bug
arrange stars in stage 1_2
fix tutorial bug: tutorial doesn't appear on stage replay
destroy level on replay or cleared
fix last commit
create tutorial command
refactor commands
clean up handle command function
create click icon
divide DialogCommand class to more child classes and handle action inside command
create EventCommand. PS: There's a bug in levelClear function
fix bug of the previous commit
separate Dialog and Tutorial. Bug: can't finish level when user clicked too early
reconstruct DialogCommand. Progress: 60%
reconstruct DialogCommand complete, All command refactor complete. TODO: Clean up DialogHelper