added Stage for mini games
renamed package
added Carrot (actor)
refactored carrot
fixed possible bug
adjusted space
changed data type of Carrot's position from int to float
removed OnTouchEvent in the parent level
Revert "removed OnTouchEvent in the parent level"

This reverts commit 7bf96facd723073b8b5b75186930d2765d4a19af.
added isHit function
added selected function
changed to dp
added recordedTouchPtY for user's activity record
renamed variable
added state
changed to mdpi
added state unselected and some bug fixes
added surfaceholder callback with some fixes
added Carrot Stage
fix error