Mouse hover event is SLOW! As a result, prop "want_hover" is default setted to "0", means disabled.

We will add additional plugin function to reset this prop in future.

2. Add a pixmap geo graphics item, for future new features.

2. set 3 method, perpare for call_func.
Signed-off-by: goldenhawking <goldenhawking@163.com>

2. Add a Item clicked event, for  geomarker.