Fix parsing complicated DBCs

reader/src/main/java/com/rusefi/can/reader/dbc/DbcFile.java

@@ -64,6 +64,10 @@ public class DbcFile {
                     // skipping header line
                     continue;
                 }
+                if (!tokens[1].equals("SG_")) {
+                    // will parse only signal descriptions
+                    continue;
+                }
                 if (tokens.length < 4)
                     throw new IllegalStateException("Failing to parse comment: " + line + " at " + lineIndex);
                 int id = Integer.parseInt(tokens[2]);