Migrate fonts to be stored as resources (#4165)

* Good start

* Impl

* allow responses.add(async { Message::NoOp });

* Fix

* Cache font blob in text node

* Refactor font handling to use Font struct direcly

* Fix fmt

* Embedd Font Resources by default

* Review

* Review

* Cache font info based on ResourceHash

node-graph/libraries/resources/src/lib.rs

@@ -26,6 +26,10 @@ impl Resource {
 	pub fn hash(&self) -> ResourceHash {
 		self.hash
 	}
+
+	pub fn empty() -> Self {
+		Self::new([])
+	}
 }
 
 impl From<&Resource> for Arc<dyn AsRef<[u8]> + Send + Sync> {
@@ -67,7 +71,7 @@ impl CacheHash for Resource {
 }
 
 /// Blake3 content hash of a resource, represented as 32 bytes
-#[derive(Clone, Copy, Debug, Default, Hash, PartialEq, Eq, PartialOrd, Ord, DynAny)]
+#[derive(Clone, Copy, Default, Hash, PartialEq, Eq, PartialOrd, Ord, DynAny)]
 pub struct ResourceHash([u8; 32]);
 
 impl From<&[u8]> for ResourceHash {
@@ -135,6 +139,12 @@ impl std::str::FromStr for ResourceHash {
 	}
 }
 
+impl std::fmt::Debug for ResourceHash {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		f.write_str(&String::from(self))
+	}
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum ResourceHashParseError {
 	InvalidLength { found: usize },
@@ -238,6 +248,18 @@ impl ResourceId {
 	}
 }
 
+impl From<u64> for ResourceId {
+	fn from(value: u64) -> Self {
+		Self(value)
+	}
+}
+
+impl From<ResourceId> for u64 {
+	fn from(id: ResourceId) -> Self {
+		id.0
+	}
+}
+
 impl std::fmt::Display for ResourceId {
 	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 		write!(f, "{}", self.0)