Fix parsing of SayText2 messages starting with color codes other than \x01

SayText2 messages can use a simplified format where the body is just
client, raw, and a single null-terminated colored text string, without
the usual kind/from/text fields. The parser detected this by peeking
the first byte after client and raw and checking if it was \x01 (color
code for default color), but the text can also start with other color
codes such as \x07 (6-char hex color). When this happened, the parser
would consume the entire message text as the kind string (falling back
to ChatAll), leaving the text and from fields empty.

src/demo/message/usermessage.rs

@@ -297,15 +297,17 @@ impl BitRead<'_, LittleEndian> for SayText2Message {
     fn read(stream: &mut Stream) -> ReadResult<Self> {
         let client = EntityId::from(stream.read::<u8>()? as u32);
         let raw = stream.read()?;
-        let (kind, from, text): (ChatMessageKind, Option<MaybeUtf8String>, MaybeUtf8String) =
+        let (kind, from, text): (ChatMessageKind, Option<MaybeUtf8String>, MaybeUtf8String) = {
-            if stream.read::<u8>()? == 1 {
+            let next_byte = stream.read::<u8>()?;
-                stream.set_pos(stream.pos() - 8)?;
+            stream.set_pos(stream.pos() - 8)?;
-
+            if next_byte > 0 && next_byte <= 8 {
+                // Starts with a color code (\x01-\x08) rather than a kind
+                // string like "TF_Chat_All", so this is the simplified format
+                // where the message body is just raw colored text without
+                // kind/from fields.
                 let text: MaybeUtf8String = stream.read()?;
                 (ChatMessageKind::ChatAll, None, text)
             } else {
-                stream.set_pos(stream.pos() - 8)?;
-
                 let kind = stream.read()?;
                 let from = stream.read()?;
                 let text = stream.read()?;
@@ -315,7 +317,8 @@ impl BitRead<'_, LittleEndian> for SayText2Message {
                     let _: u16 = stream.read()?;
                 }
                 (kind, Some(from), text)
-            };
+            }
+        };
 
         Ok(SayText2Message {
             client,