std::move is removed from return  keyword.

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.

Multiline can hold several lines in one top-level item. now, point, line, multiline, polygon, these geo types can hold WKT style geo elements in future.

2. next , we will build command support for icon items

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

2. Add a Item clicked event, for  geomarker.

pen and brush now are  independent with shapes.