UI: Tiling terminal views

[christianparpart]

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Lije a tiling window manager, but terminal views. Maybe as a tree view?

• tiling (tree based?) view of terminals
• split right/ left / bottom / top
• focus left, right, bottom, top
• toggle zoom of current tile to only show this tile

WT is having a nice implementation that we can base our ideas from:

Actions

• [ ] splitPane: split = (horizontal | vertical | auto);
• [ ] resizePane: direction = (up | right | down | left)
• [ ] moveFocus: direction = (up | right | down | left)
• [ ] zoomPane: toggles zoom of the focused pane into full-window or inlined into the grid
• [ ] closePane closes the current pane