Patcher Node placement & Auto Layouting

[fde31]

This moves some of the viewport / editor pane interactions into actions & the state. The version of Reactflow we use doesn't fully support a controlled viewport but this gets us there.

Note that with this PR:

• the built-in controls menu is replaced with a custom one to also feature the layouting button
• we introduce an auto-layout functionality
• width & height of all nodes are controlled in the graph (but not resizable just yet)
• new patcher nodes should be placed in 0,0 of the current viewport

The migration of existing sets might be a bit clumsy due to the state controlled width & height but hopefully the auto-layout makes this smoother and easier to deal with?!

see #168

Also created #187 for node resizing

[fde31]

@x37v would be cool if you could test that on your end, esp. with existing sets.
The auto-layouting seems ok so far, but I wonder if we want to push "system" nodes out of the graph to the left and right?

Note that a npm ci will be necessary here given some new deps.

[x37v]

much improved!