Add copy, paste, cut functionality

[casperlamboo]

This PR adds copy, past and cut of buildplate models to cura.

Screen.Recording.2023-08-04.at.13.25.29.mov

Copy/paste works even after a model has been deleted for the build plate (no reference is needed to the orginal model). This works by writing the serialized model data to the clipboard. As a consequence a users clipboard might look similar to this after using cura

<?xml version="1.0"?>
<model unit="millimeter" xmlns="http://schemas.microsoft.com/3dmanufacturing/core/2015/02" xmlns:cura="http://software.ultimaker.com/xml/cura/3mf/2015/10" xml:lang="en-US">
	<resources>
		<object id="1" name="cube.stl" type="model">
			<metadatagroup>
				<metadata name="cura:extruder_nr">0</metadata>
			</metadatagroup>
			<mesh>
				<vertices>
					<vertex x="-5" y="5" z="-5" />
					<vertex x="5" y="5" z="5" />
					<vertex x="5" y="5" z="-5" />
					<vertex x="5" y="5" z="5" />
					<vertex x="-5" y="5" z="-5" />
					<vertex x="-5" y="5" z="5" />
					<vertex x="-5" y="-5" z="5" />
					<vertex x="5" y="-5" z="-5" />
					<vertex x="5" y="-5" z="5" />
					<vertex x="5" y="-5" z="-5" />
					<vertex x="-5" y="-5" z="5" />
					<vertex x="-5" y="-5" z="-5" />
					<vertex x="-5" y="-5" z="5" />
					<vertex x="5" y="5" z="5" />
					<vertex x="-5" y="5" z="5" />
					<vertex x="5" y="5" z="5" />
					<vertex x="-5" y="-5" z="5" />
					<vertex x="5" y="-5" z="5" />
					<vertex x="5" y="5" z="5" />
					<vertex x="5" y="-5" z="-5" />
					<vertex x="5" y="5" z="-5" />
					<vertex x="5" y="-5" z="-5" />
					<vertex x="5" y="5" z="5" />
					<vertex x="5" y="-5" z="5" />
					<vertex x="5" y="-5" z="-5" />
					<vertex x="-5" y="5" z="-5" />
					<vertex x="5" y="5" z="-5" />
					<vertex x="-5" y="5" z="-5" />
					<vertex x="5" y="-5" z="-5" />
					<vertex x="-5" y="-5" z="-5" />
					<vertex x="-5" y="-5" z="5" />
					<vertex x="-5" y="5" z="-5" />
					<vertex x="-5" y="-5" z="-5" />
					<vertex x="-5" y="5" z="-5" />
					<vertex x="-5" y="-5" z="5" />
					<vertex x="-5" y="5" z="5" />
				</vertices>
				<triangles>
					<triangle v1="0" v2="1" v3="2" />
					<triangle v1="3" v2="4" v3="5" />
					<triangle v1="6" v2="7" v3="8" />
					<triangle v1="9" v2="10" v3="11" />
					<triangle v1="12" v2="13" v3="14" />
					<triangle v1="15" v2="16" v3="17" />
					<triangle v1="18" v2="19" v3="20" />
					<triangle v1="21" v2="22" v3="23" />
					<triangle v1="24" v2="25" v3="26" />
					<triangle v1="27" v2="28" v3="29" />
					<triangle v1="30" v2="31" v3="32" />
					<triangle v1="33" v2="34" v3="35" />
				</triangles>
			</mesh>
		</object>
	</resources>
	<build>
		<item objectid="1" transform="1.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 1.0 16.52989959716797 5.0 -0.002300000051036477" />
	</build>
</model>

After a model has been pasted the newly added objects are automatically selected.

The "cut" functionality is also added which simply works by sequencing the copy and delete selected actions.
https://github.com/Ultimaker/Cura/blob/f07faac4223d3d15d36b486e1fce18a84ea55fb0/cura/CuraActions.py#L191C6-L193

Copy paste cut can be executed by either pressing ctrl+c, ctrl+v, ctrl+x keys or by the right click context menu

CURA-7912

[nallath]

Derp. I didn't notice this the previous time. But you can actually disable 3mf reader

If the user did this, there won't be mesh_reader returned here.

[fieldOfView]

You could make the 3mf reader a required plugin, or you could disable copy/paste if the plugin is not available.

[casperlamboo]

c393d91, this change also required a change in uranium: Ultimaker/Uranium@83f88ac

[fieldOfView]

In response to the screen recording above: people are going to complain that the resulting objects get auto-arranged, disregarding the original relative positions. One of the main usecases for copy/paste - I imagine - would be to create grids.