Dockable framework

[DeflatedPickle]

A built-in dockable framework (like DockingFrames for Swing) would be helpful for users to get a program looking how they prefer.

• [ ] Draggable mini-windows, that can be placed beside other mini-windows (on their north, east, west or south sides)
• [ ] Mini-window headers (these are used to drag around the mini-window, the components should be customisable in their position)
  • [ ] Pin (optional, to lock the position of the mini-window)
  • [ ] Title
  • [ ] Minimize (optional)
  • [ ] Maximize (optional)
  • [ ] Close (optional)
• [ ] Drag listener for mini-windows being dragged over other mini-windows, putting the original mini-window in a tab with another tab for the new mini-window
• [ ] Border layout (to contain tabbed mini-windows, that will expand to cover a percentage of the whole window. These tabs are made when you drag a tab to either the north, east, south or west)
• [ ] Save layout
• [ ] Load layout

This issue depends on;

• #80
• #60
• #119