Add event support

[Tlaster]

Fire a native function

button {
    onclick = HandleClick
}

code behind (C#):

void HandleClick(object sender, object dataContext) {
    //handle the click event
}

List sample:

list {
    ...
    itemClick = HandleItemClick
}

code behind (C#):
(not sure if we should add the index as parameter)

void HandleItemClick(object sender, object dataContext) {
    //handle the item click event
}

[Tlaster]

First, we can add script support for the event like

button {
    click = ${
        it.Count++
    }
}