Convert node no longer supports strings

[0HyperCube]

A regression introduced by @Keavon in #3662.

Previously you could connect a number to the text (create text with text tool, open node graph, select text node, click dot next to text input)

Now it doesn't work:

This input type is incompatible:
• Input 2:
…found:       f64 called with Context
…expected: string called with Context

The name of the String type is now for some reason changed:

Graphite/node-graph/libraries/core-types/src/types.rs

Lines 389 to 391 in 7af60e0

	if self == &concrete!(&str) || self == &concrete!(String) {
	return write!(f, "string");
	}

So no convert node is found to match it:

Graphite/node-graph/preprocessor/src/lib.rs

Lines 72 to 84 in 7af60e0

	let into_node_identifier = ProtoNodeIdentifier::with_owned_string(format!("graphene_core::ops::IntoNode<{}>", input_ty.clone()));
	let convert_node_identifier = ProtoNodeIdentifier::with_owned_string(format!("graphene_core::ops::ConvertNode<{}>", input_ty.clone()));
	let proto_node = if into_node_registry.keys().any(|ident: &ProtoNodeIdentifier| ident.as_str() == into_node_identifier.as_str()) {
	generated_nodes += 1;
	into_node_identifier
	} else if into_node_registry.keys().any(|ident| ident.as_str() == convert_node_identifier.as_str()) {
	generated_nodes += 1;
	inputs.push(NodeInput::value(TaggedValue::None, false));
	convert_node_identifier
	} else {
	identity_node.clone()
	};