Add copy/pasting of nodes to/from clipboard in JSON

[Zehir]

This PR add the ability to copy/paste nodes to string that can be shared on discord or other media.
It's based on the idea of Factorio blueprints.
You just select node and click Copy to clipboard

And you will get a string in the clipboard like this :

{"origin":"(740.0, 80.0)","nodes":{"6":[0,{"arguments":{"material":null,"reference_data":{},"rules":{"(0, -1, 0)":false,"(0, 0, 0)":true}},"position":"(740.0, 80.0)","salt":581472843,"type":0,"uid":"uid://br8gcsyc04ksj"}]},"connections":[]}

Then when you can paste nodes from the clipboard like usual node pasting.

I also had to remove the add node popup by default on the right click for 2 reasons;

• I need to be able to always have the context menu to past from clipboard
• It's annoying to have different beavior if you have a node selected or not or an empty copy buffer

Like currently copy/paste node, the material resource is not copied but I guess we can change that in the future

[cullumi]

A couple things:

• I can't actually seem to get it to put anything into my clipboard.
• Could this be part of normal Ctrl-C / Ctrl-V behavior? I realize there'd be a slight conflict between the editor's "clipboard" and the system's clipboard, though I suspect that could be resolved.
• A "Ctrl-Shift-C / Ctrl-Shift-V" shortcut or similar might be nice, otherwise.

[Zehir]

A couple things:

• I can't actually seem to get it to put anything into my clipboard.
• Could this be part of normal Ctrl-C / Ctrl-V behavior? I realize there'd be a slight conflict between the editor's "clipboard" and the system's clipboard, though I suspect that could be resolved.
• A "Ctrl-Shift-C / Ctrl-Shift-V" shortcut or similar might be nice, otherwise.

It could but we already talk about this on discord if I remember correctly and we don't want to mess with the clipboard with the ctrl+c and ctrl+v shorcuts. We can still add shorcuts with #562 later

[BenjaTK]

I like Ctrl+Shift+V/C for the shortcuts. We can add them in #562 though.

[BenjaTK]

LGTM

[BenjaTK]

Just saw this:

I also had to remove the add node popup by default on the right click for 2 reasons;
and I disagree. I like how fast it is when you don't have a copy buffer, and it matches the functionality of the shader editor.

[BenjaTK]

LGTM

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