[KLIB] Implement new linker based on IdSignature

- Remove klib dependency on metadata and uniqID
 - Refactored proto format to make it more effective and compact
  -- Use special encoding for some types of data (coordinates, flags, types)
  -- Remove symbols table
  -- Use packed proto list if it is possible
 - Remove extension from metadata
 - Remove special ids for function interfaces
 - Fix klib IO
 - Fix incremental cache
 - General code clean up

core/metadata/src/org/jetbrains/kotlin/metadata/deserialization/Flags.java

@@ -11,7 +11,7 @@ import org.jetbrains.kotlin.metadata.ProtoBuf;
 import org.jetbrains.kotlin.protobuf.Internal;
 
 public class Flags {
-    private Flags() {}
+    protected Flags() {}
 
     // Types
     public static final BooleanFlagField SUSPEND_TYPE = FlagField.booleanFirst();