add clone method 80%
fixed bugs
add list viewex
fixed gui reader bug
1. optimize scrollview；
2. add clone method；
3. optimize listview；
Merge branch 'master' into master_nutty_optimizeguilib
Modify clone method
Fixed bug of scrollview
optimize scrollview event
Add some functions to ScrollView
Modify mk files
Modify windows project file
Add comments.
Fixed bug of scale9sprite
Fixed feedback.
Add const to Gets method
Fixed spelling mistake
Merge pull request #4024 from nutty898/master_nutty_optimizeguilib

optimize gui lib