Breaking changes

1. Widget creation now use method chain to set various properties. For example: Old style widget creation

giu.InputTextMultiline("Text area", &content, 300, 100, 0, nil)
giu.Button("Click Me", func() { fmt.Println("Clicked") })

New style widget creation

giu.InputTextMultiline("Text area", &content).Size(300, 100)
giu.Button("Click Me").OnClick(func() {...})

All xxxV methods are removed.

With method chain, giu becomes more flexible to add properties and events to any widget in future.

2. Rename MasterWindow.Main(...) to MasterWindow.Run(...).

Bump imgui to 1.7.9.

Follow upstream update, update imgui to 1.77.

Rename the tag of a release according to reasonable versioning.

Change log

1. Msgbox now has only two parameters. And provides Msgboxv for more control.
2. Fix issue that Msgbox cannot be open from menu.
3. Expose SetClipboard and GetClipboard from Platform.
4. Add DatePicker.
5. Wrap ColorfulTextEditor with minimal functions.