A workable float button on hand position
code simplification
Use m_eControlStatus and m_eControlHand to save current status
Fix timer button behavior
rename variables
Isolate code to HandControl.h
Use QHandControl as a graphics view item
1. code simplified
2. modify struct of QHandControl
Fix button size computing error
remove NIButton, use QHandIcon
First workable version to use 2-step input