Custom Application Bar

[zelcion]

Description

The current state of the application uses the OS's window top bar as its control. I think that using the upper space of the application as the top bar with our custom style would be better for two main reasons:

• Better usage of screen vertical space
• No style discrepancy between the app and the container.

Requirements

• Have all the three window control buttons: Close, Maximize (toggle), and Minimize
• No longer show system's default application top bar
• Should still be able to resize the application by its corners and edges
• Should be able to drag the window around by the custom top bar