move core::pdu and core::state_res into core::matrix::

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/matrix/pdu/id.rs

@@ -0,0 +1,22 @@
+use super::{Count, RawId};
+use crate::utils::u64_from_u8x8;
+
+pub type ShortRoomId = ShortId;
+pub type ShortEventId = ShortId;
+pub type ShortId = u64;
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct Id {
+	pub shortroomid: ShortRoomId,
+	pub shorteventid: Count,
+}
+
+impl From<RawId> for Id {
+	#[inline]
+	fn from(raw: RawId) -> Self {
+		Self {
+			shortroomid: u64_from_u8x8(raw.shortroomid()),
+			shorteventid: Count::from_unsigned(u64_from_u8x8(raw.shorteventid())),
+		}
+	}
+}