feature: programmatically hide/show or expand/collapse windows

[Norlock]

Programmatically hide/show or expand/collapse windows

Will add a new function call: Window::window_action(mut self, action: &mut Option<WindowAction>)
Also add a new function call to let the user determine if the window has a close/hide button, this is because behaviour can be done programmatically so it doesn't always require a closing button.

The actions are:

pub enum WindowAction {
    Expand,
    Collapse,
    Show,
    Hide,
    /// Toggles between show and hide
    ToggleShow,
    /// Toggles between expand and collapse
    ToggleExpand,
}

After each frame the action is consumed and executed. This way the function doesn't need to borrow,

• Closes Add methods to collapse a window #358 Programmatically open / closing windows #3517
• I have followed the instructions in the PR template

Testing

There have been 2 new buttons added for the demo_demo_app which can be used to test the functionality.